乙酰丙酮钇催化环氧氯丙烷的均聚合与共聚合

POLYMERIZATION OF EPICHLOROHYDRIN BY YTTRIUM ACETYLACETONATE

用过渡金属络合催化剂聚合环氧氯丙烷能获高分子量的聚合物。稀土络合催化剂对环氧乙烷,环氧丙烷及环硫丙烷的开环聚合具有明显效果。本文选用Y(acac)_3-H_2O-Al(i-Bu)_3催化剂,考察环氧氯丙烷的均聚合及其与环氧乙烷,环氧丙烷的共聚合。

Y(acae)_3-H_2O-Al(i-Bu)_3 was used for homopolymerization of epichlorohydrin(ECH) and copolymerization of ECH with propylene oxide(PO) or ethylene oxide(EO). The molecular weight distribution of PECH determined by GPC showed that the number of the active species in the catalyst depends on the method of catalyst preparation. For copolymerization the monomer reactivity ratios obtained by NMR as follows: 2.08/0.21 for PO/ECH, 11.9/0.21 for EO/ECH.