Polyvinylidene fluoride

Polyvinylidene fluoride (PVDF) is a highly non-reactive and pure 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 hydrocarbons. It is often 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.

Properties

PVDF exhibits a balance of properties that make it unique among fluoropolymers. It has good resistance to solvents, acids, and bases, and has a low weight. PVDF is also resistant to UV radiation, which makes it suitable for outdoor applications. It has a relatively high melting point (around 177°C) compared to other fluoropolymers, making it suitable for high temperature applications. Its mechanical properties include high abrasion resistance, toughness, and flexibility at low temperatures.

Applications

Chemical Processing Industry

In the chemical processing industry, PVDF is used for pipes, fittings, pumps, valves, and tanks. It is chosen for its chemical resistance, high purity, and mechanical strength.

Semiconductor Industry

PVDF is used in the semiconductor industry for piping and components in the manufacture of integrated circuits. Its high purity and chemical resistance make it suitable for the aggressive chemicals used in semiconductor manufacturing.

Medical Industry

In the medical industry, PVDF is used in applications where high purity and chemical resistance are necessary. It is used in the manufacturing of medical tubing and other components that come into contact with sensitive drugs.

Energy

PVDF is used in lithium-ion batteries as a binder in the electrode coating. Its chemical stability and ability to operate at high temperatures make it ideal for this application. It is also used in the construction of membranes for fuel cells.

Aerospace

The aerospace industry uses PVDF in the form of a foam for its lightweight, thermal, and acoustic insulation properties.

Environmental Impact

PVDF is considered to be an environmentally friendly material due to its long life span and recyclability. It does not emit toxic gases when burned.

Manufacturing Process

PVDF is produced through the polymerization of vinylidene difluoride. The process involves the use of a catalyst, typically a free radical initiator, under controlled conditions of temperature and pressure.

See Also

• Fluoropolymer
• Polymerization
• Vinylidene Difluoride
• Lithium Ion Battery
• Semiconductor Device Fabrication

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  Polyvinylidene fluoride structure

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  A UPW Installation using PVDF Piping