Polyvinylidene fluoride
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| Names | |
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IUPAC name
poly(1,1-difluoroethylene)
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| Other names
Polyvinylidene difluoride; poly(vinylene fluoride); Kynar; Hylar; Solef; Sygef; poly(1,1-difluoroethane)
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| Identifiers | |
24937-79-9 
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| ChEBI |
CHEBI:53250 
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| ECHA InfoCard | 100.133.181 |
| MeSH | polyvinylidene+fluoride |
| Properties | |
| -(C2H2F2)n- | |
| Appearance | whitish or translucent solid |
| not soluble in water | |
| Structure | |
| 2.1 D | |
| Related compounds | |
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Related compounds
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PVF, PVC, PTFE |
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Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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 (what is ?) |
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| Infobox references | |
Polyvinylidene fluoride, or polyvinylidene difluoride, (PVDF) is a highly non-reactive thermoplastic fluoropolymer produced by the polymerization of vinylidene difluoride.
PVDF is a specialty plastic used in applications requiring the highest purity, as well as resistance to solvents, acids and bases. Compared to other fluoropolymers, like polytetrafluoroethylene (Teflon), PVDF has a low density (1.78 g/cm3).
It is available as 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 crosslinked closed-cell foam, used increasingly in aviation and aerospace applications.
A fine powder grade, KYNAR 500 PVDF or HYLAR 5000 PVDF, is also used as the principal ingredient of 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 for western blots for immobilization of proteins, due to its non-specific affinity for amino acids.
PVDF is sold under a variety of brand names including KF (Kureha), Hylar (Solvay), Kynar (Arkema) and Solef (Solvay).
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.
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 forms: alpha (TGTG'), beta (TTTT), and gamma (TTTGTTTG') phases, depending on the chain conformations as trans (T) or gauche (G) linkages. When poled, PVDF is a ferroelectric polymer, exhibiting efficient piezoelectric and pyroelectric properties. These characteristics make it useful in sensor and battery applications. Thin films of PVDF are used in some newer thermal camera sensors.
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