Polyvinyl chloride, abbreviated as PVC (Polyvinyl chloride) in English, is the polymerization of vinyl chloride monomer (VCM) in peroxides, nitrogen compounds and other initiators; or under the action of light and heat according to the radical polymerization reaction mechanism. The resulting polymer. Vinyl chloride homopolymer and vinyl chloride copolymer are collectively referred to as vinyl chloride resin.

PVC is a white powder with an amorphous structure. The degree of branching is small, the relative density is about 1.4, the glass transition temperature is 77~90℃, and it starts to decompose at about 170℃. It has poor stability to light and heat, above 100℃ or after a long time. Exposure to sunlight will decompose to produce hydrogen chloride, which will further autocatalyze the decomposition, causing discoloration, and the physical and mechanical properties will also decline rapidly. In practical applications, stabilizers must be added to improve heat and light stability.

The molecular weight of industrially produced PVC is generally in the range of 50,000 to 110,000, with a large polydispersity, and the molecular weight increases with the decrease of the polymerization temperature; it has no fixed melting point, starts to soften at 80-85°C, and becomes viscoelastic at 130°C. , 160～180℃ begin to transform into viscous fluid state; it has good mechanical properties, tensile strength is about 60MPa, impact strength is 5～10kJ/m2; it has excellent dielectric properties.

PVC used to be the world's largest production of general-purpose plastics, and it is widely used. It is widely used in building materials, industrial products, daily necessities, floor leather, floor tiles, artificial leather, pipes, wires and cables, packaging films, bottles, foaming materials, sealing materials, fibers, etc.