【摘要】 以纳米级固定化猪胰脂肪酶(IMPPL)催化三亚甲基碳酸酯(TMC)的开环聚合,研究了IMPPL浓度、聚合反应温度和聚合反应时间对聚三亚甲基碳酸酯(PTMC)分子量和产率的影响.同时也研究了回收再利用的IMPPL对TMC开环聚合的催化作用以及IMPPL对PTMC的降解作用.实验结果表明,IMPPL不仅在60～100℃能有效地催化TMC的开环聚合,而且在较高的温度下IMPPL可以有效地催化PTMC的降解.回收使用的固定化酶可表现较高的催化活性及重复利用性.更多还原

【Abstract】 The ring-opening polymerization of trimethylene carbonate(TMC) catalyzed by the immobilized porcine pancreas lipase on silica nanoparticles(IMPPL) was explored. The influences of IMPPL concentration and reaction temperature as well as reaction time on the molecular weight and yield of PTMC were studied. The ring-opening polymerization of TMC using the recycling IMPPL and the degradation of PTMC in the presence of IMPPL were also investigated. The experimental data showed that this IMPPL could not only catalyze the ring-opening polymerization of TMC at 60—100 ℃ efficiently, but also catalyze the degradation of PTMC at relatively high temperatures. The recycling IMPPL showed better catalytic activity and could be used repeatedly.更多还原