战术性
丙烯
茂金属
共聚物
高分子化学
后茂金属催化剂
聚丙烯
材料科学
聚合
聚乙烯
乙烯
熔点
大分子单体
催化作用
高分子科学
化学
聚合物
复合材料
有机化学
作者
Werner Kaminsky,Sascha Rulhoff
出处
期刊:Polimery
[LUKASIEWICZ Research Network, Industrial Chemistry Research Institute]
日期:2008-05-01
卷期号:53 (05): 339-344
标识
DOI:10.14314/polimery.2008.339
摘要
Metallocene/methylalumoxane catalysts can be used to synthesize macromonomers of ethylene as well as copolymers of propene with macromonomers. In the experiments Me2C(Cp)2ZrCl2 is used which let polymerize ethylene to macromonomers but is unable to cause propene polymerization. After addition of Ph2C(Cp)(Flu)ZrCl2 and propene, long chain branched polypropylenes are produced with isotactic, syndiotactic or atactic backbone. The differences of crystalline or amorphic polypropylene backbone with crystalline polyethylene side chains were investigated. It was shown that the melting temperature (Tm) decreases strongly with increasing concentration of macromonomers in the copolymers. To reduce the melting point by 20°C 0.1 mol. % of macromonomers is sufficient.
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