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Question:

How to distinguish between rubber and polyvinyl chloride?

How to distinguish between rubber and polyvinyl chloride?

Answer:

Adhesive (Rubber): highly elastic polymeric material with reversible deformation.At room temperature, elastic, in a small rubber under the action of external force can produce greater deformation, remove the external force can restore the original state. Rubber is a completely amorphous polymer, its glass transition temperature is low, the molecular weight is often very large, more than hundreds of thousands.
The molecular chain of rubber can be crosslinked, and the crosslinked rubber can recover quickly when it is deformed by external force, and has good physical and mechanical properties and chemical stability. Rubber is the basic raw material of rubber industry. It is widely used in making tyres, rubber hoses, tapes, cables and other kinds of rubber products.
1) preparation: vinyl chloride monomer (vinyl, chloride, monomer, referred to as VCM) in peroxide, azo compounds and other initiators; or under the action of light and heat, polymerization by the principle of free radical polymerization of polymers. The vinyl chloride homopolymer and vinyl chloride copolymer are collectively referred to as vinyl chloride resins.2) properties: white powder, amorphous structure, degree of branching is small, the relative density of about 1.4, the glass transition temperature of 77~90 DEG, 170 DEG C to decompose, the stability of heat and light, at 100 DEG C or after long time exposure to sunlight, will decompose and produce hydrogen chloride, and further automatic catalytic decomposition that change, the physical and mechanical properties also decreased rapidly, in the practical application must be added in order to improve the stability of heat and light stabilizer of the.

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