马来酸酐─环氧丙烷共聚物的合成及结构表征

本文将稀土络合物Ｎｄ（Ｐ２０４）３，Ｎｄ（Ｐ５０７），Ｎｄ（ｎａｐｈ）３，Ｎｄ（ａｃａｃ）３．３Ｈ２Ｏ与烷基铝组成的二元体系催化剂用于共聚马来酸酐（ＭＡｎ）与环氧丙烷（ＰＯ）获得成功，并采用１Ｈ－ＮＭＲ研究了共聚的优良催化剂，可得到高转化率，高交替度共聚物，共聚物数均分子量Ｍｎ和分子量分布分别为２０００－３０００，１．３－１．７，共聚物中ＭＡｎ的摩尔含量４０％以上。共聚物组成及序列分布与投料比，催

SYNTHESIS AND STRUCTURAL CHARACTERIZATION OF MAn-PO COPOLYMER PREPARED BY RARE EARTH COORDINATION CATALYST

Ring - opening copolymerization of maleic anhydride alAn ) with propylene oxide (PO) was successfully caacced out by using rare earth complexes (i. e.,Nd (P₂₀₄)₃, Nd (P₅₀₇)₃, Nd (naph)₃ and Nd(acac)₃ 3H₂O ) in combinationwith aluminum alkyls as catalysts for the first time. The relative concentration oftriads of the MAn-PO copolylner obtained was investigated on the basis of1H-NMR in devil. The results showed that the rare earth coordination systemswere favourable catalysts for the copolymerizahon of MAn with PO, giving high yield and almost alternating opolymer. The number- average molecular weight and molecular weight distribution were in the range of 2000-3000 and 1.3-1.7 respectively. The composition and the monomer distribution were affect-ed by the monomer charge ratio,the sort of catalyst,and the property of solvent.It was also found that the monmer composition of copolymer predicted from the thire- order Markoffian process fit the observed ¹H-NMR data perfectly.