Polyvinylidene fluoride typical properties

PVC, another widely used polymer for wire and cable insulation, crosslinks under irradiation in an inert atmosphere. When irradiated in air, scission predominates.To make cross-linking dominant, multifunctional monomers, such as trifunctional acrylates and methacrylates, must be added. Fluoropolymers, such as copol5miers of ethylene and tetrafluoroethylene (ETFE), or polyvinylidene fluoride (PVDF) and polyvinyl fluoride (PVF), are widely used in wire and cable insulations. They are relatively easy to process and have excellent chemical and thermal resistance, but tend to creep, crack, and possess low mechanical stress at temperatures near their melting points. Radiation has been found to improve their mechanical properties and crack resistance. Ethylene propylene rubber (EPR) has also been used for wire and cable insulation. When blended with thermoplastic polyefins, such as low density polyethylene (LDPE), its processibility improves significantly. The typical addition of LDPE is 10%. Ethylene propylene copolymers and terpolymers with high PE content can be cross-linked by irradiation. ... 

The structure of polyvinylidene fluoride chain, namely, alternating CH2 and CF2 groups, has an effect on its properties which combine some of the best performance characteristics of both polyethylene (-CH2-CH2-)n and polytetrafluoroethylene (-CF2-CF2-)n. Certain commercial grades of PVDF are copolymers of VDF with small amounts (typically less than 6%) of other fluorinated monomers, such as HFP, CTFE, and TFE. These exhibit somewhat different properties than the homopolymer. 

Typical Electrical Properties of Polyvinylidene Fluoride Homopolymer... 

The relaxational behaviour of polyvinylidene fluoride (PVDF) is of interest. Its p phase exhibits piezo- and pyroelectric properties and so it is used in various devices, such as sensors, transducers or actuators for different applications. Typically such materials are prepared through a technological process involving stretching and... 

KYNAR pol5n inylidene fluoride was introduced in 1960. First commercial production began in 1965. For the first five years of its life, KYNAR resin was used almost exclusively in the electrical and electronic market. In 1965, the architectural finish, KYNAR 500 , was introduced followed by first plant expansion in 1969. In 1975, KYNAR 460 was introduced for high speed wire extrusion. In 1981, the Underwriter Laboratories listed KYNAR resins for use in plenum cables that can be used without conduit. In 1983, a new homopolymer series was introduced known as the series 700 and was followed by KYNAR FLEX 2800 in 1984. To meet the demands of the growing markets, a new plant for KYNAR resins was built and placed in operation in 1985. Also that year, new coating resins, KYNAR SL and KYNAR ADS , were introduced. KYNAR polyvinylidene fluoride is a crystalline polymer that is produced by the emulsion polymerization technique. Typical properties are discussed. 

A typical example for the frequency- and temperature-dependent dielectric properties of a piezoelectric polymer is given in Fig. 7 that displays the a-relaxation, related the dynamic glass transition, of a polyvinylidene fluoride (PVDF) film along with an upswing of the dielectric loss at low frequencies due to electrical conduction. 

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