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Ⅰ.緒言 在乙烯型加聚反應中所採用的催化作用一詞,实係指一個放熱鏈反應的引發作用而言。無論鏈的開始是由游離基,正烃基陽碳離子或是負烃基陰碳離子所引起,所謂催化劑都必須提供用以引起鏈增長的活潑中心的。在過去卄五年間,對於產生這種在預定時間中具有所需要的濃度的活潑中心的能力方面,我們曾積累了相當的一些知識及技術經驗。並且可以公允地說:我們在乙烯型聚合物鏈的引發方面已具有相當的基本概念,而且能進行實際的控制。我們還可藉引入能加速鏈終止反應,使整個聚合反應停止的調節劑(telomer)及改進劑對鏈終止的進行產生某
I. INTRODUCTION The term catalytic action used in the polyaddition reaction of ethylene refers to the initiation of an exothermic chain reaction. Whether the beginning of the chain is caused by free radicals, n-hydrocarbyloxys or n-alkanions, the so-called catalyst must provide a live center for the chain growth. In the past five years, we have had some considerable knowledge and technical experience in generating such an active center of concentration of the concentration needed for a predetermined period of time. And it is fair to say that we already have quite basic concepts in the initiation of vinyl polymer chains and that we can actually control them. We can also introduce a telomer that can accelerate the chain termination reaction and stop the entire polymerization reaction,