1. In the presence of tbutyl iodid,however,the molecular weight of PMMA obtained as well as the polymerization of MMA will be affected remarkably.
   而碘代叔丁烷对MMA聚合速率和分子量均有影响：以丁酮为溶剂时，碘代叔丁烷起链转移剂作用；

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