Polyvinylidene fluoride

Last updated

Contents

Polyvinylidene fluoride
Polyvinylidenfluorid.svg
Names
IUPAC name
Poly(1,1-difluoroethylene) [1]
Other names
Polyvinylidene difluoride; poly(vinylene fluoride); Kynar; Hylar; Solef; Sygef; poly(1,1-difluoroethane)
Identifiers
ChEBI
ChemSpider
  • None
ECHA InfoCard 100.133.181 OOjs UI icon edit-ltr-progressive.svg
MeSH polyvinylidene+fluoride
PubChem CID
Properties
−(C2H2F2)n−
AppearanceWhitish or translucent solid
Melting point 177 °C (351 °F)
Insoluble
Structure
2.1 D [2]
Related compounds
Related compounds
 PVF, PVC, PTFE
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
X mark.svgN  verify  (what is  Yes check.svgYX mark.svgN ?)

Polyvinylidene fluoride or polyvinylidene difluoride (PVDF) is a highly non-reactive thermoplastic fluoropolymer produced by the polymerization of vinylidene difluoride. Its chemical formula is (C2H2F2)n.

PVDF is a specialty plastic used in applications requiring the highest purity, as well as resistance to solvents, acids and hydrocarbons. PVDF has low density 1.78 g/cm3 in comparison to other fluoropolymers, like polytetrafluoroethylene.

It is available in the form of piping products, sheet, tubing, films, plate and an insulator for premium wire. It can be injected, molded or welded and is commonly used in the chemical, semiconductor, medical and defense industries, as well as in lithium-ion batteries. It is also available as a cross-linked closed-cell foam, used increasingly in aviation and aerospace applications, and as an exotic 3D printer filament. It can also be used in repeated contact with food products, as it is FDA-compliant and non-toxic below its degradation temperature. [3]

As a fine powder grade, it is an ingredient in high-end paints for metals. These PVDF paints have extremely good gloss and color retention. They are in use on many prominent buildings around the world, such as the Petronas Towers in Malaysia and Taipei 101 in Taiwan, as well as on commercial and residential metal roofing.

PVDF membranes are used in western blots for the immobilization of proteins, due to its non-specific affinity for amino acids.

PVDF is also used as a binder component for the carbon electrode in supercapacitors and for other electrochemical applications.

Names

PVDF is sold under a variety of brand names including KF (Kureha), Hylar (Solvay), Kynar (Arkema) and Solef (Solvay).

Synthesis

The easiest way of synthesizing PVDF is the radical polymerization of vinylidene fluoride (VF2), however, the polymerization is not completely regiospecific. The asymmetric structure of VF2 leads to the orientation isomers during the polymerization. The configuration of the monomer in the chain can be either "head to head" or "head to tail".

Figure 4: Three orientation isomers of polyvinylidene fluoride Ferroelectric-wiki-w1.png
Figure 4: Three orientation isomers of polyvinylidene fluoride

To get more control on the regiospecific polymer synthesis, copolymerization was proposed. One of these methods is introducing the precursor polymer made from copolymerization of VF2 with either 1-chloro-2,2-difluoroethylene (CVF2) or 1-bromo-2,2-difluoroethylene( BVF2). The chlorinated or brominated monomers are attacked at their CF2 carbon by growing –CH2CF2∙ radical. After reductive dechlorination or debromination with tri-n-butyltin hydride they become a reversed VF2 unit in the final polymer. Therefore, a regioisomer of PVDF is formed. [4]

Figure 5: Scheme of regiospecific polymer synthesis Ferroelectric-wiki-w2.png
Figure 5: Scheme of regiospecific polymer synthesis
Figure 6: Schematic description of two most common conformations of PVDF, the left one is tg tg and the right one is all trans, the yellow sphere represents fluorine atom, the white sphere represents hydrogen atom and the grey sphere represents the carbon atom. Ferroelectric-wiki-w3.png
Figure 6: Schematic description of two most common conformations of PVDF, the left one is tg tg and the right one is all trans, the yellow sphere represents fluorine atom, the white sphere represents hydrogen atom and the grey sphere represents the carbon atom.

Properties

In 1969, strong piezoelectricity was observed in PVDF, with the piezoelectric coefficient of poled (placed under a strong electric field to induce a net dipole moment) thin films as large as 6–7 pC/N: 10 times larger than that observed in any other polymer. [5]

PVDF has a glass transition temperature (Tg) of about −35 °C and is typically 50–60% crystalline. To give the material its piezoelectric properties, it is mechanically stretched to orient the molecular chains and then poled under tension. PVDF exists in several phases depending on the chain conformations as trans (T) or gauche (G) linkages: TGTG' for α and δ phase, TTTT for β phases, and TTTGTTTG' for γ and ε phases. The α and ε conformations lack piezoelectric properties because of the antiparallel alignment of dipoles within its unit cell. The β, γ, and δ phases feature a parallel arrangement of dipoles, rendering them polar crystals with a non-zero dipole moment. Among these phases, the β phase stands out due to its remarkable remnant polarization and the highest dipolar moment per unit cell, garnering more interest compared to the others. [6] When poled, PVDF is a ferroelectric polymer, exhibiting efficient piezoelectric and pyroelectric properties. [7] These characteristics make it useful in sensor and battery applications. Thin films of PVDF are used in some newer thermal camera sensors.

Unlike other popular piezoelectric materials, such as lead zirconate titanate (PZT), PVDF has a negative d33 value. Physically, this means that PVDF will compress instead of expand or vice versa when exposed to the same electric field. [8]

Thermal

Fluorinated polymers like PTFE and PVDF are especially thermally stable due to strong carbon-fluorine (C–F) bonds, the strongest in organic chemistry, which contribute to the durability of these materials under heat. PVDF is semi-crystalline, giving it a balance of rigidity and flexibility across temperatures from −35 °C to 160 °C. Above 316 °C, PVDF decomposes via dehydrofluorination, which can lead to structural changes, including double bonds and potential discoloration from thermal decomposition. [9]

Chemical compatibility

PVDF exhibits an increased chemical resistance and compatibility among thermoplastic materials. PVDF is considered to have excellent / inert resistance to: [9]

PVDF Resistance to Chemicals
Chemical20 °C, 30 days50 °C, 30 days
Organic Solvents
Acetone33
Benzene12
Chlorobenzene11
Chloroform11
Cyclohexane11
Diethylene glycol1-
Dimethyl formamide (DMF)--
Diethylamine13
Dioxane33
Ethyl acetate12
Ethylene glycol11
Glycerol11
Naphthalene11
Tetrahydrofuran (THF)23
Trichloroethane11
Xylol11
Acids and Bases
Acetic acid (10%)11
Acetic acid (100%)11
Formic acid (10%)11
Hydrochloric acid11
Hydrogen peroxide (90%)1-
Lactic acid12
Nitric acid (10%)11
Nitric acid (Conc.)22
Sulfuric acid (10%)11
Sulfuric acid (90%)11
Sulfuric acid (fuming/monohydrate)33
Tetrahydrofuran23
Trichlorofluoromethane11
Zinc chloride (50%)11
Zinc sulfate (50%)11
Alcohols
Benzyl alcohol (pure)11
Ethanol (30%)11
Methanol11
Methyl alcohol (10%)11
Methyl alcohol (pure)11
Phenol (10%)11
Phenol (100%)11
Propanol11
Oils and Fats
Butyl acetate12
Coconut oil11
Pine oil11
Mineral oils11
Paraffin oil11
Food Products
Milk11
Glucose13
Olive oil11
Vinegar12
Wine11

Key: 1—Resistant, 2—Limited resistant, 3—Not resistant

Chemical sensitivity

PVDF, similar to other fluoropolymers, exhibits chemical sensitivity, in general, with the following chemical families:

Intrinsic properties and resistance

Polyvinylidene fluoride expresses inherent resistance characteristics in certain high-focus applications. Namely these are: ozone oxidation reactions, nuclear radiation, UV damage, and microbiological, fungus growth.[ citation needed ] PVDF's resistance to these conditions is fairly distinctive among thermoplastic materials. PVDF's carbon and fluoride elemental stability contributes to this resistance, as well as the polymeric integration of PVDF during its processing.[ citation needed ]

Processing

PVDF may be synthesized from the gaseous vinylidene fluoride (VDF) monomer by a free-radical (or controlled-radical) polymerization process. This may be followed by processes such as melt casting, or processing from a solution (e.g. solution casting, spin coating, and film casting). Langmuir–Blodgett films have also been made. In the case of solution-based processing, typical solvents used include dimethylformamide and the more volatile butanone. In aqueous emulsion polymerization, the fluorosurfactant perfluorononanoic acid is used in anion form as a processing aid by solubilizing monomers. [11] Compared to other fluoropolymers, it has an easier melt process because of its relatively low melting point of around 177 °C.

Processed materials are typically in the non-piezoelectric alpha phase. The material must either be stretched or annealed to obtain the piezoelectric beta phase. The exception to this is for PVDF thin films (thickness in the order of micrometres). Residual stresses between thin films and the substrates on which they are processed are great enough to cause the beta phase to form.

In order to obtain a piezoelectric response, the material must first be poled in a large electric field. Poling of the material typically requires an external field of above 30 megavolts per metre (MV/m). Thick films (typically >100  μm) must be heated during the poling process in order to achieve a large piezoelectric response. Thick films are usually heated to 70–100 °C during the poling process.

A quantitative defluorination process was described by mechanochemistry, [12] for safe eco-friendly PVDF waste processing.

Applications

PVDF piping used to carry ultrapure water A UPW Installation using PVDF Piping.png
PVDF piping used to carry ultrapure water

PVDF is a thermoplastic that expresses versatility for applications similar to other thermoplastics, particularly fluoropolymers. PVDF resin is heated and handled for use in extrusion and injection molding to produce PVDF pipes, sheets, coatings, films, and molded PVDF products, such as bulk containers. Common industry applications for PVDF thermoplastics include: [10]

In electronics / electricity

PVDF is commonly used as insulation on electrical wires, because of its combination of flexibility, low weight, low thermal conductivity, high chemical corrosion resistance, and heat resistance. Most of the narrow 30-gauge wire used in wire wrap circuit assembly and printed circuit board rework is PVDF-insulated. In this use the wire is generally referred to as "Kynar wire", from the trade name.

The piezoelectric properties of PVDF are exploited in the manufacture of tactile sensor arrays, inexpensive strain gauges, and lightweight audio transducers. Piezoelectric panels made of PVDF are used on the Venetia Burney Student Dust Counter, a scientific instrument of the New Horizons space probe that measures dust density in the outer Solar System. [13]

PVDF is the standard binder material used in the production of composite electrodes for lithium-ion batteries. [14] Solution of PVDF 1−2% by mass in N-methyl-2-pyrrolidone (NMP) is mixed with an active lithium storage material such as graphite, silicon, tin, LiCoO2, LiMn2O4, or LiFePO4 and a conductive additive such as carbon black or carbon nanofibers. This slurry is cast onto a metallic current collector, and the NMP is evaporated to form a composite or paste electrode. PVDF is used because it is chemically inert over the potential range used and does not react with the electrolyte or lithium.

In biomedical science

In the biomedical sciences, PVDF is used in immunoblotting as an artificial membrane (usually with 0.22 or 0.45-micrometre pore sizes), on which proteins are transferred using electricity (see western blotting). PVDF is resistant to solvents and, therefore, these membranes can be easily stripped and reused to look at other proteins. PVDF membranes may be used in other biomedical applications as part of a membrane filtration device, often in the form of a syringe filter or wheel filter. The various properties of this material, such as heat resistance, resistance to chemical corrosion, and low protein binding properties, make this material valuable in the biomedical sciences for preparation of medications as a sterilizing filter, and as a filter to prepare samples for analytical techniques such as high-performance liquid chromatography (HPLC), where small amounts of particulate matter can damage sensitive and expensive equipment.

PVDF transducers have the advantage of being dynamically more suitable for modal testing than semiconductor piezoresistive transducers and more compliant for structural integration than piezoceramic transducers. For those reasons, the use of PVDF active sensors is a keystone for the development of future structural-health monitoring methods, due to their low cost and compliance. [15]

In high-temperature processes

PVDF is used as piping, sheet, and internal coatings in high-temperature, hot acid, radiation environment applications due to PVDF's resistance characteristics and upper temperature thresholds. As piping, PVDF is rated up to 248 °F (120 °C). Examples of PVDF uses include nuclear reactor waste handling, chemical synthesis and production, (sulfuric acid, common), air plenums, and boiler service pipe.

Other uses

PVDF is used for specialty monofilament fishing lines, sold as fluorocarbon replacements for nylon monofilament. The surface is harder, so it is more resistant to abrasion and sharp fish teeth. Its refractive index is lower than nylon, which makes the line less discernible to fish eyes. It is also denser than nylon, making it sink faster towards fish. [16]

Other forms

Copolymers

The copolymer Poly(vinylidene fluoride-co-hexafluoropropylene) or PVDF-HFP is used as a co-polymer in the blades of artificial turf. [17] Addition of organoclay to PVDF-HFP via melt compounding stabilizes the β piezoelectric phase. [18]

Copolymers of PVDF are also used in piezoelectric and electrostrictive applications. One of the most commonly used copolymers is P(VDF-trifluoroethylene), usually available in ratios of about 50:50 and 65:35 by mass (equivalent to about 56:44 and 70:30 molar fractions). Another one is P(VDF-tetrafluoroethylene). They improve the piezoelectric response by improving the crystallinity of the material.

While the copolymers' unit structures are less polar than that of pure PVDF, the copolymers typically have a much higher crystallinity. This results in a larger piezoelectric response: d33 values for P(VDF-TFE) have been recorded to be as high as −38 p C/N [19] compared to −33 pC/N in pure PVDF. [20]

Terpolymers

Terpolymers of PVDF are the most promising one in terms of electromechanically induced strain. The most commonly used PVDF-based terpolymers are P(VDF-TrFE-CTFE) and P(VDF-TrFE-CFE). [21] [22] This relaxor-based ferroelectric terpolymer is produced by random incorporation of the bulky third monomer (chlorotrifluoroethylene, CTFE) into the polymer chain of P(VDF-TrFE) copolymer (which is ferroelectric in nature). This random incorporation of CTFE in P(VDF-TrFE) copolymer disrupts the long-range ordering of the ferroelectric polar phase, resulting in the formation of nano-polar domains. When an electric field is applied, the disordered nano-polar domains change their conformation to all-trans conformation, which leads to large electrostrictive strain and a high room-temperature dielectric constant of ~50. [23]

Safety and regulations

PVDF is widely considered safe and ubiquitous used for water treatment, [24] the food industry, and biocompatible devices like hernia meshes or internal devices. PVDF differs from PFAS in that alternating groups are hydrogen, making it less resilient to high temperatures, but also meaning that byproducts don't degrade into known hazardous PFAS. [25] However, studies examining ecotoxity have shown that very high concentrations (up to 100 mg/L) may alter jellyfish behavior, while not being toxic to them. [26] In the US, FDA regulations consider PVDF to be food safe, [27] while US EPA water treatment regulations on PFAS have avoided placing limits on PVDF, while strictly limit concentrations of PFAS. [28]

PVDF was added to the Living Building Challenge (LBC) Red List in 2022. The Red List bans substances prevalent in the building industry that pose serious risks to human health and the environment from construction that seeks to meet the criteria of the Living Building Challenge (LBC). [29]

Proposed regulations in the EU aim to ban "any substance that contains at least one fully fluorinated methyl (CF3) or methylene (CF2-) carbon atom (without any H/Cl/Br/I attached to it)”. [30] Unless exemptions are made, the application of inconsistent and severe regulations may propose an existential risk to the industry. [31]

See also

Related Research Articles

<span class="mw-page-title-main">Piezoelectricity</span> Electric charge generated in certain solids due to mechanical stress

Piezoelectricity is the electric charge that accumulates in certain solid materials—such as crystals, certain ceramics, and biological matter such as bone, DNA, and various proteins—in response to applied mechanical stress. The word piezoelectricity means electricity resulting from pressure and latent heat. It is derived from Ancient Greek πιέζω (piézō) 'to squeeze or press' and ἤλεκτρον (ḗlektron) 'amber'. The German form of the word (Piezoelektricität) was coined in 1881 by the German physicist Wilhelm Gottlieb Hankel; the English word was coined in 1883.

<span class="mw-page-title-main">Polytetrafluoroethylene</span> Synthetic polymer

Polytetrafluoroethylene (PTFE) is a synthetic fluoropolymer of tetrafluoroethylene, and has numerous applications because it is chemically inert. The commonly known brand name of PTFE-based composition is Teflon by Chemours, a spin-off from DuPont, which originally discovered the compound in 1938. Polytetrafluoroethylene is a fluorocarbon solid, as it is a high-molecular-weight polymer consisting wholly of carbon and fluorine. PTFE is hydrophobic: neither water nor water-containing substances wet PTFE, as fluorocarbons exhibit only small London dispersion forces due to the low electric polarizability of fluorine. PTFE has one of the lowest coefficients of friction of any solid.

<span class="mw-page-title-main">Thermoplastic</span> Plastic that softens with heat and hardens on cooling

A thermoplastic, or ThermoSoftNingplastic, is any plastic polymer material that becomes pliable or moldable at a certain elevated temperature and solidifies upon cooling.

<span class="mw-page-title-main">Lithium polymer battery</span> Lithium-ion battery using a polymer electrolyte

A lithium polymer battery, or more correctly, lithium-ion polymer battery, is a rechargeable battery of lithium-ion technology using a polymer electrolyte instead of a liquid electrolyte. Highly conductive semisolid (gel) polymers form this electrolyte. These batteries provide higher specific energy than other lithium battery types. They are used in applications where weight is critical, such as mobile devices, radio-controlled aircraft, and some electric vehicles.

A fluoropolymer is a fluorocarbon-based polymer with multiple carbon–fluorine bonds. It is characterized by a high resistance to solvents, acids, and bases. The best known fluoropolymer is polytetrafluoroethylene under the brand name "Teflon," trademarked by the DuPont Company.

<span class="mw-page-title-main">Polyvinyl fluoride</span> Chemical compound

Polyvinyl fluoride (PVF) or –(CH2CHF)n– is a polymer material mainly used in the flammability-lowering coatings of airplane interiors and photovoltaic module backsheets. It is also used in raincoats and metal sheeting. Polyvinyl fluoride is a thermoplastic fluoropolymer with a repeating vinyl fluoride unit, and it is structurally very similar to polyvinyl chloride.

<span class="mw-page-title-main">Polychlorotrifluoroethylene</span> Chemical compound

Polychlorotrifluoroethylene (PCTFE or PTFCE) is a thermoplastic chlorofluoropolymer with the molecular formula (CF2CClF)n, where n is the number of monomer units in the polymer molecule. It is similar to polytetrafluoroethene (PTFE), except that it is a homopolymer of the monomer chlorotrifluoroethylene (CTFE) instead of tetrafluoroethene. It has the lowest water vapor transmission rate of any plastic.

<span class="mw-page-title-main">Monofilament fishing line</span> Fishing line made from a single fiber of plastic

Monofilament fishing line is fishing line made from a single fiber of plastic material, as opposed to multifilament or braided fishing lines constructed from multiple strands of fibers. Most fishing lines are now nylon monofilament because they are cheap to manufacture and can be produced in a range of diameters which have different tensile strengths. Monofilament line is also available in different colors, such as clear, white, green, blue, red, and fluorescent.

<span class="mw-page-title-main">Electroactive polymer</span>

An electroactive polymer (EAP) is a polymer that exhibits a change in size or shape when stimulated by an electric field. The most common applications of this type of material are in actuators and sensors. A typical characteristic property of an EAP is that they will undergo a large amount of deformation while sustaining large forces.

Tetrafluoroethylene (TFE) is a fluorocarbon with the chemical formula C2F4. It is the simplest perfluorinated alkene. This gaseous species is used primarily in the industrial preparation of fluoropolymers.

The electrocaloric effect is a phenomenon in which a material shows a reversible temperature change under an applied electric field.

<span class="mw-page-title-main">ECTFE</span> Corrosion-resistant polymer

ECTFE (ethylene-chlorotrifluoroethylene) is an alternating copolymer of ethylene and chlorotrifluoroethylene. It is a semi-crystalline fluoropolymer, with chemical corrosion resistance properties.

FKM is a family of fluorocarbon-based fluoroelastomer materials defined by ASTM International standard D1418, and ISO standard 1629. It is commonly called fluorine rubber or fluoro-rubber. FKM is an abbreviation of Fluorine Kautschuk Material. All FKMs contain vinylidene fluoride as the common monomer, to which different other monomers are added for specific types and functionalities, fitting the desired application.

In materials science, a polymer blend, or polymer mixture, is a member of a class of materials analogous to metal alloys, in which at least two polymers are blended together to create a new material with different physical properties.

Electron-beam processing or electron irradiation (EBI) is a process that involves using electrons, usually of high energy, to treat an object for a variety of purposes. This may take place under elevated temperatures and nitrogen atmosphere. Possible uses for electron irradiation include sterilization, alteration of gemstone colors, and cross-linking of polymers.

<span class="mw-page-title-main">Plastic pipework</span> Tubular section or hollow cylinder made of plastic

Plastic pipe is a tubular section, or hollow cylinder, made of plastic. It is usually, but not necessarily, of circular cross-section, used mainly to convey substances which can flow—liquids and gases (fluids), slurries, powders and masses of small solids. It can also be used for structural applications; hollow pipes are far stiffer per unit weight than solid members.

<span class="mw-page-title-main">Ferroelectric polymer</span> Group of crystalline polar polymers that are also ferroelectric

Ferroelectric polymers are a group of crystalline polar polymers that are also ferroelectric, meaning that they maintain a permanent electric polarization that can be reversed, or switched, in an external electric field.

<span class="mw-page-title-main">1,1-Difluoroethylene</span> Chemical compound

1,1-Difluoroethylene, also known as vinylidene fluoride, is a hydrofluoroolefin. This colorless, flammable gas is a difluorinated derivative of ethylene. Global production in 1999 was approximately 33,000 metric tons. It is primarily used in the production of fluoropolymers such as polyvinylidene fluoride and FKM.

<span class="mw-page-title-main">Perfluoroalkoxy alkane</span> Family of polymers

Perfluoroalkoxy alkanes (PFA) are fluoropolymers. They are copolymers of tetrafluoroethylene (C2F4) and perfluoroethers (C2F3ORf, where Rf is a perfluorinated group such as trifluoromethyl (CF3)). The properties of these polymers are similar to those of polytetrafluoroethylene (PTFE). Compared to PTFE, PFA has better anti-stick properties and higher chemical resistance, at the expense of lesser scratch resistance.

<span class="mw-page-title-main">Graft polymer</span> Polymer with a backbone of one composite and random branches of another composite

In polymer chemistry, graft polymers are segmented copolymers with a linear backbone of one composite and randomly distributed branches of another composite. The picture labeled "graft polymer" shows how grafted chains of species B are covalently bonded to polymer species A. Although the side chains are structurally distinct from the main chain, the individual grafted chains may be homopolymers or copolymers. Graft polymers have been synthesized for many decades and are especially used as impact resistant materials, thermoplastic elastomers, compatibilizers, or emulsifiers for the preparation of stable blends or alloys. One of the better-known examples of a graft polymer is a component used in high impact polystyrene, consisting of a polystyrene backbone with polybutadiene grafted chains.

References

  1. ↑ "poly(vinylene fluoride) (CHEBI:53250)" . Retrieved 14 July 2012.
  2. ↑ Zhang, Q. M., Bharti, V., Kavarnos, G., Schwartz, M. (Ed.), (2002). "Poly (Vinylidene Fluoride) (PVDF) and its Copolymers", Encyclopedia of Smart Materials, Volumes 1–2, John Wiley & Sons, 807–825.
  3. ↑ "PVDF (Polyvinylidene fluoride, Tecaflon ®, Solef®, Kynar®) | Plastics International".
  4. ↑ Cais, R.E.; Kometani, J.M. (1985). "Synthesis and two-dimensional NMR of highly aregic poly(vinylidene fluoride)". Macromolecules. 18 (6): 1354–1357. Bibcode:1985MaMol..18.1354C. doi:10.1021/ma00148a057.
  5. ↑ Kawai, Heiji (1969). "The Piezoelectricity of Poly (vinylidene Fluoride)". Japanese Journal of Applied Physics. 8 (7): 975–976. Bibcode:1969JaJAP...8..975K. doi:10.1143/JJAP.8.975. S2CID   122316276.
  6. ↑ Martins, P.; Lopes, A.C.; Lanceros-Mendez, S. (April 2014). "Electroactive phases of poly(vinylidene fluoride): Determination, processing and applications". Progress in Polymer Science. 39 (4): 683–706. doi:10.1016/j.progpolymsci.2013.07.006. ISSN   0079-6700.
  7. ↑ Lolla, Dinesh; Gorse, Joseph; Kisielowski, Christian; Miao, Jiayuan; Taylor, Philip L.; Chase, George G.; Reneker, Darrell H. (17 December 2015). "Polyvinylidene fluoride molecules in nanofibers, imaged at atomic scale by aberration corrected electron microscopy". Nanoscale. 8 (1): 120–128. Bibcode:2015Nanos...8..120L. doi:10.1039/c5nr01619c. ISSN   2040-3372. PMID   26369731. S2CID   205976678.
  8. ↑ Lolla, Dinesh; Lolla, Manideep; Abutaleb, Ahmed; Shin, Hyeon U.; Reneker, Darrell H.; Chase, George G. (9 August 2016). "Fabrication, Polarization of Electrospun Polyvinylidene Fluoride Electret Fibers and Effect on Capturing Nanoscale Solid Aerosols". Materials. 9 (8): 671. Bibcode:2016Mate....9..671L. doi: 10.3390/ma9080671 . PMC   5510728 . PMID   28773798.
  9. 1 2 Saxena, Pooja; Shukla, Prashant (March 2021). "A comprehensive review on fundamental properties and applications of poly(vinylidene fluoride) (PVDF)". Advanced Composites and Hybrid Materials. 4 (1): 8–26. doi:10.1007/s42114-021-00217-0.
  10. 1 2 "PVDF Performance & Characteristics Data" (PDF). Plastic Pipe Solutions.
  11. ↑ Prevedouros K.; Cousins I. T.; Buck R. C.; Korzeniowski S. H. (January 2006). "Sources, fate and transport of perfluorocarboxylates". Environ. Sci. Technol. 40 (1): 32–44. Bibcode:2006EnST...40...32P. doi:10.1021/es0512475. PMID   16433330.
  12. ↑ Zhang, Qiwu; Lu, Jinfeng; Saito, Fumio; Baron, Michel (2001). "Mechanochemical solid-phase reaction between polyvinylidene fluoride and sodium hydroxide" (PDF). Journal of Applied Polymer Science. 81 (9): 2249. doi:10.1002/app.1663.
  13. ↑ Horanyi, Mihaly (2010). "First results from the Venetia Burney Student Dust Counter on the New Horizons mission". Geophysical Research Letters. 37 (11). Bibcode:2010GeoRL..3711101P. doi: 10.1029/2010GL043300 . S2CID   129795884.
  14. ↑ Ordoñez, J.; Gago, E. J.; Girard, A. (1 July 2016). "Processes and technologies for the recycling and recovery of spent lithium-ion batteries" (PDF). Renewable and Sustainable Energy Reviews. 60: 195–205. Bibcode:2016RSERv..60..195O. doi:10.1016/j.rser.2015.12.363. ISSN   1364-0321.
  15. ↑ Guzman, E.; Cugnoni, J.; Gmür, T. (2013). "Survivability of integrated PVDF film sensors to accelerated ageing conditions in aeronautical/aerospace structures". Smart Mater. Struct. 22 (6): 065020. Bibcode:2013SMaS...22f5020G. doi:10.1088/0964-1726/22/6/065020. S2CID   136758382.
  16. ↑ Seaguar history  — Kureha America, Inc. manufacturer's site. Archived 20 June 2010 at the Wayback Machine
  17. ↑ McMenemy, Jeff (10 December 2021). "Portsmouth to test for PFAS in new turf field. Is it dangerous? City says no. Others disagree". Portsmouth Herald. Retrieved 30 December 2021.
  18. ↑ Kelarakis, Antonios; Hayrapetyan, Suren; Ansari, Seema; Fang, Jason; Estevez, Luis; Giannelis, Emmanuel P. (January 2010). "Clay nanocomposites based on poly(vinylidene fluoride-co-hexafluoropropylene): Structure and properties". Polymer. 51 (2): 469–474. doi:10.1016/j.polymer.2009.11.057. hdl: 1813/23433 .
  19. ↑ Omote, Kenji; Ohigashi, Hiroji; Koga, Keiko (1997). "Temperature dependence of elastic, dielectric, and piezoelectric properties of "single crystalline" films of vinylidene fluoride trifluoroethylene copolymer". Journal of Applied Physics. 81 (6): 2760. Bibcode:1997JAP....81.2760O. doi:10.1063/1.364300.
  20. ↑ Nix, E. L.; Ward, I. M. (1986). "The measurement of the shear piezoelectric coefficients of polyvinylidene fluoride". Ferroelectrics. 67 (1): 137–141. Bibcode:1986Fer....67..137N. doi:10.1080/00150198608245016.
  21. ↑ Xu, Haisheng; Cheng, Z.-Y.; Olson, Dana; Mai, T.; Zhang, Q. M.; Kavarnos, G. (16 April 2001). "Ferroelectric and electromechanical properties of poly(vinylidene-fluoride–trifluoroethylene–chlorotrifluoroethylene) terpolymer". Applied Physics Letters. 78 (16). AIP Publishing LLC, American Institute of Physics: 2360–2362. Bibcode:2001ApPhL..78.2360X. doi:10.1063/1.1358847.
  22. ↑ Bao, Hui-Min; Song, Jiao-Fan; Zhang, Juan; Shen, Qun-Dong; Yang, Chang-Zheng; Zhang, Q. M. (3 April 2007). "Phase Transitions and Ferroelectric Relaxor Behavior in P(VDF−TrFE−CFE) Terpolymers". Macromolecules. 40 (7). ACS Publications: 2371–2379. Bibcode:2007MaMol..40.2371B. doi:10.1021/ma062800l.
  23. ↑ Ahmed, Saad; Arrojado, Erika; Sigamani, Nirmal; Ounaies, Zoubeida (14 May 2015). "Electric field responsive origami structures using electrostriction-based active materials". In Goulbourne, Nakhiah C. (ed.). Behavior and Mechanics of Multifunctional Materials and Composites 2015. Vol. 9432. Society of Photographic Instrumentation Engineers (SPIE). p. 943206. Bibcode:2015SPIE.9432E..06A. doi:10.1117/12.2084785. ISBN   978-1-62841-535-3. S2CID   120322803.{{cite book}}: |journal= ignored (help)
  24. ↑ Pankratz, Tom (17 April 2023). "All PFAS are not created Equal". Water Desalination Report. 59 (14): 1.
  25. ↑ Rabuni, Mohamad Fairus (1 January 1970). "The contrastive study of chemical treatment on the properties of hydrophobic PVDF membrane". Journal of Applied Science & Process Engineering. 2 (1). doi:10.33736/jaspe.163.2015. ISSN   2289-7771.
  26. ↑ Di Giannantonio, Michela; Gambardella, Chiara; Miroglio, Roberta; Costa, Elisa; Sbrana, Francesca; Smerieri, Marco; Carraro, Giovanni; Utzeri, Roberto; Faimali, Marco; Garaventa, Francesca (17 August 2022). "Ecotoxicity of Polyvinylidene Difluoride (PVDF) and Polylactic Acid (PLA) Microplastics in Marine Zooplankton". Toxics. 10 (8). MDPI AG: 479. doi: 10.3390/toxics10080479 . ISSN   2305-6304. PMC   9416274 . PMID   36006158.
  27. ↑ "Code of Federal Regulations Title 21". accessdata.fda.gov. 22 December 2023. Retrieved 22 June 2024.
  28. ↑ "Interim Guidance on the Destruction and Disposal of Perfluoroalkyl and Polyfluoroalkyl Substances and Materials Containing Perfluoroalkyl and Polyfluoroalkyl Substances—Version 2 (2024)" (PDF). EPA. Retrieved 22 June 2024.
  29. ↑ "LBC Red List CASRN Guide 2024". International Living Future Institute. Retrieved 5 November 2024.
  30. ↑ "Registry of restriction intentions until outcome". ECHA. Retrieved 22 June 2024.
  31. ↑ Pankratz, Tom (17 June 2024). "PVDF membranes' uncertain future". Water Desalination Report. 60 (23): 1.
This page is based on this Wikipedia article
Text is available under the CC BY-SA 4.0 license; additional terms may apply.
Images, videos and audio are available under their respective licenses.