PVC is a white powder with an amorphous structure, with a small degree of branching. The glass transition temperature is 77~90℃, and it starts to decompose around 170℃[1]. It has poor stability to light and heat. It is above 100℃ or exposed to long-term sunlight. , It will decompose to produce hydrogen chloride, and further autocatalytic decomposition, causing discoloration, and the physical and mechanical properties are also rapidly reduced. In practical applications, stabilizers must be added to improve the stability to heat and light.
The molecular weight of industrially produced PVC is generally in the range of 50,000 to 110,000. It has a large polydispersity. The molecular weight increases with the decrease of polymerization temperature. There is no fixed melting point. It 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, the tensile strength is about 60MPa, the impact strength is 5～10kJ/m2, and 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.
