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what is polypropylene

Polypropylene is a thermoplastic resin produced by polymerization of propylene.According to the arrangement of methyl groups, there are three kinds of isotactic polypropylene, atactic polypropylene (atactic polypropylene) and syndiotactic polypropylene (syndiotactic polypropylene).

The same side of the methyl groups are arranged in the main chain of the molecule called isotactic polypropylene, if methyl chaotic are arranged at both sides of the main chain molecules called atactic polypropylene, when both sides of the methyl arranged alternately in the main chain of the molecule called syndiotactic polypropylene.Industrial products are mainly composed of isotopes.Polypropylene also includes copolymer of propylene with a small amount of ethylene.Usually translucent colorless solid, odorless and non-toxic.Because of its neat and high crystallization structure, so the melting point can be as high as 167 ℃.Heat resistance, corrosion resistance, the use of steam sterilization is a prominent advantage.Small density, the lightest general plastic.The disadvantage is that the low temperature impact resistance is relatively easy to be aged, but can be overcome by modification.

Copolymer of PP material with low thermal deformation temperature (100 ℃), low transparency and gloss, low rigidity, but have stronger impact strength, impact strength of PP increased with the increase of ethylene content increased.PP vicat softening temperature is 150 ℃.


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