Polyvinyl chloride (Polyvinyl Chloride), is a vinyl chloride monomer (vinyl Chloride Monomer, referred to as VCM) in the peroxide, azo compounds and other initiators, or under the action of light, heat polymerization by the free radical polymerization mechanism of polymer. Vinyl chloride polymers and vinyl chloride copolymers are called vinyl chloride resins.
PVC is amorphous structure of white powder, a small degree of support, relative density of about 1.4, glass temperature 77, 170 Shan began to decompose around , the poor stability of light and heat, in 100 Shan above or after a long period of sunlight exposure, will decompose and produce hydrogen chloride, and further automatic catalytic decomposition, causing discoloration, physical and mechanical properties are also rapidly reduced, in practical applications must add stabilizer to improve the stability of heat and light.
The molecular weight of PVC in industrial production is generally within the range of 50,000 dates, and has a large dispersion the molecular weight increased with the decrease of polymerization temperature, no fixed melting point, 8008 began to soften, 130 Shan changed into Viscoelastic State, 160 began to change to viscous-flow state, good mechanical properties, tensile strength of 60MPa or so, impact intensity 5a 1010; Excellent dielectric properties.
PVC has been the world's largest production of general-purpose plastics, widely used. In building materials, industrial products, daily necessities, flooring leather, floor tiles, artificial leather, pipe, wire and cable, packaging film, bottles, foam materials, sealing materials, fiber and other aspects are widely used.