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2024-11-29 17:23 本頁(yè)面
【文章內(nèi)容簡(jiǎn)介】 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聚苯乙烯鏈段 聚丁二烯鏈段 熱塑性彈性體 Northwest University Cationic Polymerization Northwest University Cationic Polymerization 推電子基團(tuán)使 C=C電子云密度增加，有利于陽(yáng)離子活性種進(jìn)攻 碳陽(yáng)離子形成后，推電子基團(tuán)的存在使碳上電子云稀少的情況有所改善，體系能量有所降低，碳陽(yáng)離子的穩(wěn)定性增加 原則上： 具有推電子基的烯類單體原則上可進(jìn)行陽(yáng)離子聚合 以烯類單體為例 Northwest University Cationic Polymerization 鏈增長(zhǎng)反應(yīng)比其副反應(yīng)快，即生成的碳陽(yáng)離子有
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