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What is PVC?

2014-08-04

Referred to as PVC, a thermoplastic resin made ​​by the polymerization of vinyl chloride in the role of initiator. Is a vinyl chloride homopolymer. Vinyl chloride homopolymers and vinyl chloride copolymers are collectively referred to as a vinyl chloride resin. PVC is a white amorphous powder, a small degree of branching. Industrial production of PVC molecular weight is generally in the range of 50,000 ~ 120,000, with a larger and more dispersed, lower molecular weight with polymerization temperature increases; no fixed melting point, 80 to 8 PVC .
5 ℃ begins to soften, 130 ℃ into viscoelastic state, 160 ~ 180 ℃ viscous flow started to change; better mechanical properties, tensile strength of about 60MPa, the impact strength of 5 ~ 10kJ / m2; has excellent dielectric performance. However, poor stability to light and heat, at or above 100 ℃ after prolonged exposure to sunlight, it will decompose to produce hydrogen and further autocatalytic decomposition, cause discoloration, physical and mechanical properties are rapidly decreased in practice must be added to stabilize agents to improve the stability to heat and light. PVC is very hard, very poor solubility, only a few solvent, dissolved in cyclohexanone, dichloroethane, tetrahydrofuran and the like, and organic and inorganic acids, bases, salts are stable, with the use of the chemical stability of the temperature rise reduced. PVC was dissolved in acetone - carbon disulfide or acetone - benzene solvent for dry spinning or wet spinning fibers from, said polyvinyl chloride. With a flame retardant, acid, anti-microbial, wear and has good heat retention and elasticity.


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