PVC is a white powder with amorphous structure, small branching degree, glass transition temperature 77~90 ° C, 170 ° C or so began to decompose [1], poor stability of light and heat, above 100 ° C or after a long time of sunlight exposure, it will decompose and produce hydrogen chloride, and further automatic catalytic decomposition, causing discoloration, physical and mechanical properties are also rapidly declining, In practical applications, stabilizers must be added to improve the stability of heat and light.
The molecular weight of industrial PVC is generally in the range of 50,000 ~ 110,000, with a large polydispersity, molecular weight increases with the decrease of polymerization temperature, there is no fixed melting point, 80 ~ 85 ° C begins to soften, 130 ° C becomes viscoelastic state, 160 ~ 180 ° C begins to change into viscoelastic state; It has good mechanical properties, tensile strength about 60 MPa, impact strength 5 ~ 10kJ/m2; It has excellent dielectric properties. PVC is insoluble in common solvents, but will expand in monomers and some chlorinated hydrocarbon solvents.
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