聚合物载体－稀土金属络合物的研究ⅩⅤ．聚（苯乙烯－丙烯酰胺）载体－氯化钕络合物对异戊二烯聚合的催化行为

Research on Polymer Supported Rare Earth Metal Complexes ⅩⅤ. Catalytic Behavior of Poly(Styrene Acrylamide) SupportedNeodymium Chloride for Polymerization of Isoprene

研究了聚（苯乙烯－丙烯酰胺）（ＰＳＡＣ）载体－氯化钕（ＮｄＣｌ３）络合物对异戊二烯（Ｉｐ）聚合的催化行为．ＰＳＡＣ·ＮｄＣｌ３络合物保留了小分子稀土催化剂对双烯烃聚合的催化规律和高度的定向效应．络合物的催化活性随着Ｎｄ／Ｉｐ和Ａｌ／Ｎｄ比的增加而增加，所得聚异戊二烯的特性粘数［η］却随之下降．聚异戊二烯的顺式－１，４结构含量达９５％．此外，ＰＳＡＣ·ＮｄＣｌ３络合物的活性受ＰＳＡＣ和ＰＳＡＣ·ＮｄＣｌ３的组成与结构的影响．在一定的条件下，络合物的活性随着ＰＳＡＣ中功能团含量的增加而下降．ＰＳＡＣ中单体链节交替分布的程度越低。

The catalytic behavior of poly(styrene acrylamide)(PSAC)supported neodymium chloride(NdCl 3) complex for the polymerization of isoprene has been studied. The PSAC·NdCl 3 complex has kept the catalytic regularity and the high stereospecificity of low molecular weight rare earth catalysts in the polymerization of conjugated dienes. The catalytic activity of the PSAC·NdCl 3 complex increases with increasing Nd/Ip and Al/Nd ratios, while the intrinsic viscosity of the obtained polyisoprene decreases. The activity of the PSAC·NdCl 3 with high content of functional group in the PSAC is lower. The catalytic activity is higher when the level of the alternating 1∶1 sequence of both monomers is lower.