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【简答题】
用14C放射性同位素制备的AIBN引发合成的聚苯乙烯的平均聚合度为 1.52X10^4。测得AIBN在闪烁器中的放射性计数为9.81X10^7mol－1·min－1。而3.22g聚苯乙烯的放射活性计数为203min－1。试根据计算确定这一聚合反应的动力学链终止方式。
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