Abstract:

The carbonates with different terminal groups were synthesized by transesterification of 1,6-hexanediol and dimethyl carbonate，diethyl carbonate，dipropyl carbonate，diisopropyl carbonate，dibutyl carbonate，respectively. Based on the analysis of products，the activities of dimethyl carbonate and dibutyl carbonate were higher，while the activities of diethyl carbonate，dipropyl carbonate，diisopropyl carbonate were similar. Referring to the NMR analysis of products of carbonate oligomer with different end group with glycerol，the activity of alkyloxy group in carbonate was in the order：MeO> BuO>PrO> EtO>i-PrO. The possible mechanism of the transesterification was proposed.

摘要：

采用碳酸酯（二甲酯﹑二乙酯﹑二正丙酯﹑二异丙酯及二正丁酯）与1,6-己二醇反应制备不同端基的碳酸酯齐聚物，产物结构分析表明，碳酸二甲酯及碳酸二正丁酯的反应活性较高，碳酸二正丙酯﹑碳酸二乙酯及碳酸二异丙酯的反应活性相近。结合不同封端的齐聚碳酸酯与乙二醇反应产物的核磁共振分析，碳酸酯中烷氧基的反应活性顺序为：甲氧基>丁氧基>丙氧基>乙氧基>异丙氧基。同时，讨论了酯交换反应的可能机理。