Polypropylene is obtained by catalytic polymerization of propylene using a Ziegler - Natta catalyst, which is a crystalline isotactic polymer in which molecular chain links are well aligned. The English name of polypropylene is Polypropylene , referred to as PP , commonly known as 100% plastic. Polypropylene can be divided into isotactic polypropylene and random polypropylene according to its crystallinity. Isotactic polypropylene is a highly crystalline thermoplastic resin with crystallinity of over 95% and molecular weight between 8 and 150,000 . Propylene is mainly isotactic polypropylene. The random polypropylene is a non-crystalline, slightly viscous white wax at room temperature with a low molecular weight ( 3000 to 10000 ). The structure is irregular and lacks cohesion, and the application is less.
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