chloride (PVC) is a polymer formed by free radical polymerization of vinyl chloride monomers (VCM) with initiators such as peroxide and azo compounds or under the action of light and heat. Vinyl chloride homopolymer and vinyl chloride copolymer are called vinyl chloride resin.

PVC is amorphous structure of white powder, branching degree is small, glass transition temperature 77~90℃, 170℃ or so began to decompose [1], the stability of light and heat is poor, above 100℃ or after a long time of sunlight exposure, it will decompose and produce hydrogen chloride, and further automatic catalytic decomposition, cause discoloration, physical and mechanical properties also rapidly decline, In practical application, it is necessary to add stabilizer to improve the stability of heat and light.

The PVC molecular weight of industrial production is generally in the range of 50,000 ~ 110,000, with a large polydispersity, molecular weight with the decrease of polymerization temperature and increase, no fixed melting point, 80 ~ 85℃ began to soften, 130℃ into viscoelastic state, 160 ~ 180℃ began to change into viscoelastic state; Good mechanical properties, tensile strength of 60MPa, impact strength of 5 ~ 10kJ/m2; It has excellent dielectric properties.

PVC used to be the world's largest production of general plastics, very widely used. In building materials, industrial products, daily necessities, floor leather, floor tile, artificial leather, pipe, wire and cable, packaging film, bottles, foam materials, sealing materials, fibers and other aspects are widely used.

On October 27, 2017, polyvinyl chloride was included in the list of carcinogens published by the International Agency for Research on Cancer of the World Health Organization. chloride (PVC) is a polymer formed by free radical polymerization of vinyl chloride monomers (VCM) with initiators such as peroxide and azo compounds or under the action of light and heat. Vinyl chloride homopolymer and vinyl chloride copolymer are called vinyl chloride resin.

PVC is amorphous structure of white powder, branching degree is small, glass transition temperature 77~90℃, 170℃ or so began to decompose [1], the stability of light and heat is poor, above 100℃ or after a long time of sunlight exposure, it will decompose and produce hydrogen chloride, and further automatic catalytic decomposition, cause discoloration, physical and mechanical properties also rapidly decline, In practical application, it is necessary to add stabilizer to improve the stability of heat and light.

The PVC molecular weight of industrial production is generally in the range of 50,000 ~ 110,000, with a large polydispersity, molecular weight with the decrease of polymerization temperature and increase, no fixed melting point, 80 ~ 85℃ began to soften, 130℃ into viscoelastic state, 160 ~ 180℃ began to change into viscoelastic state; Good mechanical properties, tensile strength of 60MPa, impact strength of 5 ~ 10kJ/m2; It has excellent dielectric properties.

PVC used to be the world's largest production of general plastics, very widely used. In building materials, industrial products, daily necessities, floor leather, floor tile, artificial leather, pipe, wire and cable, packaging film, bottles, foam materials, sealing materials, fibers and other aspects are widely used.

On October 27, 2017, polyvinyl chloride was included in the list of carcinogens published by the International Agency for Research on Cancer of the World Health Organization.