摘要
稀土化合物催化内酯开环聚合（Ⅲ）──氯化钕－环氧化合物体系催化ε－己内酯本体聚合申有青，沈之荃，沈建良，张富尧，张一烽（浙江大学高分子科学与工程学系，杭州，３１００２７）关键词氯化钕，环氧化合物，ε－己内酯，本体聚合聚己内酯（ＰＣＬ）和聚丙交酯（ＰＬ...
Bulk polymerization of ε-caprolactone(CL) with neodymium chloride-epoxide sys tem has been studied. It was found that the addition of epoxide can greatly increase the catalytic activity of neodymium chloride. The catalytic activity sequence of NdCl_3 combined with epoxide is: NdCl_3-ethylene oxide > NdCl_3-proplene oxide > NdCl_3-epichlorohydrin≈NdCl_3-allyl glycidyl ether. The catalytic activity of NdCl_3-proplene oxide system increases ,but molecular weight of resulting polycaprolactone(PCL) decreases at higher proplene oxide/ neodymium chloride molar ratio.The molecular weight of PCL can be controlled by catalyst concentration. Higher polymerization temperature can greatly increase the catalytic efficien cy. At 30℃ , PCL with molecular weight as high as 28. 9×10￣4 can be prepared easily with an activity of 44× 10￣4 g PCL per molar neodymium , and at 60℃ , the molecular weight of PCL and catalytic efficiency increased to 42 ×10￣4 and 10￣6 g PCL/mole Nd respectively.
出处
《高等学校化学学报》
CSCD
北大核心
1995年第5期820-822,共3页
Chemical Journal of Chinese Universities
基金
国家自然科学基金
