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 Polyvinyl chloride, English referred to as PVC (Polyvinyl chloride), is a vinyl chloride monomer (vinyl chloride monomer, referred to asVCM) in the peroxide, azo compound initiator; or, in the light under the action of heat polymerized by free radical reaction mechanism of polymerization of polymers. Vinyl chloride homopolymers andcopolymers of vinyl chloride called vinyl chloride resin.

PVC is a kind of white powder of amorphous structure, the degree of support is small, the relative density of about 1.4, the glass transition temperature of 77~90 DEG C, 170 DEG C began to decompose [1], thermal and optical stability of difference, at 100 DEG C or after long time exposure to sunlight, will decompose andproduce hydrogen chloride, and further automatic catalytic decomposition, causing discoloration, physical mechanical properties are also decreased rapidly, in the practical applicationmust add stabilizer to improve the heat and light stability.

The molecular weight of PVC in industrial production is generally in the 50000 to 110000 range, with larger polydispersity, molecular weight increases with decreasing polymerization temperature; no fixed melting point, 80 to 85 DEG C began to soften, 130 degreesinto the viscous elastic state, 160 to 180 DEG C began to changeinto the viscous flow has better mechanical properties; the tensile strength, impact strength of about 60MPa, 5 ~ 10kJ/m2; hasexcellent dielectric properties.