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The molecular weight of polypropylene

by:Qusheng     2020-11-11
Block copolymerization AP3 melt at about 11, similar molecular weight distribution which are mentioned in the literature about 5. 13, Mw at around 300000.
made in Singapore, is a block copolymerization polypropylene, a bimodal distribution, MI 10. Around 9.
structured the same side of the methyl groups are arranged in the main chain of the molecule called isotactic polypropylene. If

polypropylene resin 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. Generally in the production of polypropylene resin, isotactic structure of the content is 95%, the rest is random or syndiotactic polypropylene. Industrial products such as rules as the main ingredient. Polypropylene also includes copolymer of propylene and a small amount of ethylene. Usually a transparent colorless solid, odorless drug-free. Because of its neat and high crystallization structure, therefore, melting point 167 ℃, heat resistant, products available steam sterilization is its outstanding advantages. Density of 0. 90 g/cm3, which is the lightest general plastics. Corrosion resistance, tensile strength 30 mpa, intensity, rigidity and transparency are better than polyethylene. Drawback is the low temperature impact resistance is poor, easy ageing, but can be respectively through modification and adding antioxidants to be overcome.
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