Thursday 3 May 2018

Polyvinylidene Fluoride (PVDF)

PVDF (PVF2 or Polyvinylidene fluoride or polyvinylidene difluoride) is a semi-crystalline, high purity thermoplastic fluoropolymer.

News from Omnexus.

With service temperatures up to 150°C, PVDF displays good combination of properties such as:
  • Exceptional chemical resistance
  • High mechanical strength
  • Piezoelectric and pyroelectric properties
  • As well as good processability
Its highly desirable insolubility and electrical properties result from the polarity of alternating CH2 and CF2 groups on the polymer chain.

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.

It has many electronic applications, especially as jacketing materials for plenum-rated cable used in voice and video devices and alarm systems. The low flame spread and smoke generation of PVDF is a prime asset in these applications.

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.

PVDF (homopolymers and copolymers) 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.

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