northwestuniversity内容摘要:
on high polymers. Giulio Natta Giulio Natta(February 26, 1903May 2, 1979) was an Italian chemist . His work at the Politeico led to the improvent of earlier work by Ziegler and to the development of the ZieglerNatta catalyst. He won the Nobel Prize in Chemistry in 1963, with Kar Waldemar Ziegler, for work on high polymers. Northwest University Ionic Polymerization SBS : StyreneButadieneStyrene Hard Hard Soft C H 2 C H C H C H 2 C H 2 C HC H 2 C H聚苯乙烯链段 聚丁二烯链段 热塑性弹性体 Northwest University Cationic Polymerization Northwest University Cationic Polymerization 推电子基团使 C=C电子云密度增加,有利于阳离子活性种进攻 碳阳离子形成后,推电子基团的存在使碳上电子云稀少的情况有所改善,体系能量有所降低,碳阳离子的稳定性增加 原则上: 具有推电子基的烯类单体原则上可进行阳离子聚合 以烯类单体为例 Northwest University Cationic Polymerization 链增长反应比其副反应快,即生成的碳阳离子有。northwestuniversity
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