Polyvinylidene Fluoride (PVDF)
Polyvinylidene fluoride (PVDF) is a semi crystalline thermoplastic fluoropolymer. PVDF is generally synthesized by the free radical polymerization of 1,1-difluoroethylene (CH2=CF2). The polymerization takes place in the suspension or emulsion from 10-150°C and pressure of 10-300 atm. The material obtained is then processed into film or sheets.
PVDF displays properties such as:
Exceptional chemical resistance
High mechanical strength
Piezoelectric and pyroelectric properties
PVDF is a tough plastic that is resistant to flame, electricity, and attack by most chemicals. PVDF is readily melt-processible and can be fabricated into parts by injection and compression molding. As a result, it is commonly employed in chemical processing equipment such as pumps, valves, pipes, tubes and fittings; sensors and actuators etc.
PVDF is also piezoelectric, changing its electrical charge in response to pressure and, conversely, exerting pressure in response to an applied electric field. This unique property makes it a good material for transducers in devices such as headphones, microphones, and sonic detectors.
PVDF is gaining acceptance as a binder for cathodes and anodes in lithium-ion batteries, and as a battery separator in lithium-ion polymer systems.
Emerging applications of PVDF include fuel cell membranes, and components for aircraft interiors and office automation equipment.