摘要
研究以壳聚糖（Ｃｓ）作为高分子金属催化剂载体，制得负载稀土金属化合物的高分子金属催化剂，应用于环氧乙烷（ＢＯ）和环氧丙烷（ＰＯ）的共聚合反应。研究发现以三异丁基铝（Ａｌ（ｉ－Ｂｕ）３）为助催化剂，乙酰丙酮（Ａｃａｃ）为第三组分时，该体系的催化活性高达１９２ｋｇｃｏｐｏｌｙｍｅｒ／ｍｏｌＹ，比非负载型稀土催化体系活性提高１个数量级以上。环氧乙烷和环氧丙烷的竞聚率ｒ１（ＥＯ）、ｒ２（ＰＯ）分别为２．７５±０．０２和０．５５±０．０１；并用１３Ｃ－ＮＭＲ谱和ＤＳＣ谱对共聚物结构进行了表征。
Natural polymer chitosan supported rare earth catalysts were prepared and were used in the copolymerization of ethylene oxide and propylene oxide. They have been found that the catalytical activity of this system can be reached 192 kg·copolymer/mol·Y and the copolymerization rate is very rapid with high yield. The reactivity ratios of r 1(EO)=2.75±0.02, r 2(PO)=0.55±0.01 were determined. The microstructure of the copolymer was studied by 13 C NMR spectroscopy and DSC spectrum.
出处
《高分子材料科学与工程》
EI
CAS
CSCD
北大核心
1999年第4期30-33,共4页
Polymer Materials Science & Engineering
基金
国家教委博士点专项基金
浙江大学曹光彪高科技发展基金
关键词
壳聚糖
负载稀土金属
环氧乙烯
环氧丙烷
共聚合
chitosan supported rare earth
ethylene oxide
propylene oxide
copolymerization
