第一届网络课程大赛 Recognition of free radical polymerization situation3task2-1.ppt

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2020-09-11 发布于北京
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第一届网络课程大赛 Recognition of free radical polymerization situation3task2-1.ppt

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Termination The two methods of termination in radical polymerizations are combination and disproportionation.两种终止基团聚合的方法是偶合和歧化。 The first of these occurs when two radical species react together to form a single bond and one reaction product as in reaction below.当两个基团相互反应形成单键，第一种情况就发生了，一种反应产物如下面反应所示。 Task 2 Recognition of free radical polymerization(1)typical reaction processes Alternatively, two radicals can interact via hydrogen abstraction, leading to the formation of two reaction products, one of which is saturated and one of which is unsaturated. This is known as disproportionation (reaction below). Task 2 Recognition of free radical polymerization(1)typical reaction processes Alternatively, two radicals can interact via hydrogen abstraction, leading to the formation of two reaction products, one of which is saturated and one of which is unsaturated. 或者，两个基团可通过氢的转移相互作用，导致形成两种反应产物，一种是饱和的一种是不饱和的。 This is known as disproportionation (reaction below).这就是众所周知的歧化反应（反应如下）。 Task 2 Recognition of free radical polymerization(1)typical reaction processes Both termination mechanisms have been shown to occur experimentally, the method being to examine the polymer molecules formed for fragments of initiator. In such a way polystyrene has been found to terminate mainly by combination and poly(methyl methacrylate) entirely by disproportionation at temperatures above 60°C[8]. Task 2 Recognition of free radical polymerization(1)typical reaction processes Both termination mechanisms have been shown to occur experimentally, the method being to examine the polymer molecules formed for fragments of initiator.实验证明两种终止机理都会发生，实验方法是检验生成的聚合物分子中的引发剂碎片。 In such a way polystyrene has been found to terminate mainly by combination and poly(methyl methacrylate) entirely by disproportionation at temperatures above 60 °C[8]. 这样，发现聚苯乙烯主要以偶合方式终止，而聚甲基丙烯酸甲酯在60°C以上完全以歧化方式终止。 Task 2 Recognition of free radical polymerization(1)typical reaction processes Summarization本篇需要掌握的单词Words: viny