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首页> 外文期刊>Journal of Applied Polymer Science >Zwitterionic ring opening polymerization of lactide by metal free catalysts: Production of cyclic polymers
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Zwitterionic ring opening polymerization of lactide by metal free catalysts: Production of cyclic polymers

机译：无金属催化剂对丙交酯的两性离子开环聚合：环状聚合物的生产

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摘要

Tailor made N-heterocyclic carbene (NHC) catalyst precursors namely (+) and (-) 1-methyl-3-menthoxymethyl imidazolium chloride have been synthesized in high yield with a literature modified procedure. A reaction of catalyst precursor with potassium tert butoxide in situ generates the NHC catalyst. The zwitterionic ring opening polymerization of lactide (LA) mediated by a catalytic system composed of NHC catalyst at 25°C under argon atmosphere led to a cyclic poly(lactide) of a high molecular weight with a narrow molecular weight distribution. The cyclic poly(lactide) was characterized by NMR spectroscopy, Gel Permeation Chromatography (GPC) and Matrix-assisted laser desorption ionization-time of flight mass spectrometry (MALDI-TOF MS). The NHC catalysts are active for lactide polymerization in the presence of air and elevated temperatures at 55°C.
机译：量身定制的N-杂环卡宾（NHC）催化剂前体，即（+）和（-）1-甲基-3-薄荷基甲基咪唑氯化物，已通过文献修饰的方法高收率合成。催化剂前体与叔丁醇钾原位反应生成NHC催化剂。在25°C，氩气气氛下，由NHC催化剂组成的催化体系介导的丙交酯（LA）的两性离子开环聚合反应生成了高分子量且分子量分布窄的环状聚丙交酯。通过NMR光谱，凝胶渗透色谱（GPC）和基质辅助激光解吸电离飞行时间质谱（MALDI-TOF MS）对环状聚丙交酯进行了表征。 NHC催化剂在空气和55°C高温下对丙交酯聚合反应有活性。

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