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Syndiotactic propylene–ethylene copolymers have been synthesized with a single-center C s -symmetric syndiospecific metallocene catalyst. A study of the effect of the presence of ethylene comonomeric units on the polymorphic behavior of syndiotactic polypropylene (sPP) and on the structural transitions occurring during stretching is reported. For copolymer samples with low ethylene contents,...
After the discovery of single center metallocene catalysts in the 1980s highly stereoregular syndiotactic polypropylene showing high crystallinity and melting temperature has been produced. This new type of syndiotactic polypropylene has shown completely novel physical properties, compared to the stereoirregular and regioirregular polymer first prepared in the 1960s with Ziegler–Natta catalysts. The...
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