聚合物载体-稀土金属络合物的研究 Ⅷ.聚合物载体-双金属络合物对丁二烯聚合的催化活性

RESEARCH ON POLYMER-SUPPORTED RARE EARTH METAL COMPLEXES VIII. CATALYTIC ACTIVITY OF POLYMER- SUPPORTED BIMETAL COMPLEXES IN THE POLYMERIZATION OF BUTADIENE

研究了苯乙烯-丙烯酸共聚物载体-双金属络合物(SAAC·Nd·Na,SAAC·Nd·Fe)的合成以及由其组成的新型丁二烯聚合催化体系.发现在双金属络合物中Nd与游离的-COOH功能团的摩尔比较小时体系的催化活性最佳.对于SAAC·Nd·Fe体系,随着Fe含量的增加活性逐渐下降.对于SAAC·Nd·Na体系,无论Na含量多少都有着促进活性提高的作用,只是在Nd/-COOH摩尔比较小时活性提高较大.此外,初步考察了在邻啡绕啉存在下SAAC·Nd·Fe体系聚合丁二烯的活性以及所得产物的微观结构与络合物SAAC·Nd·Fe中Fe的含量关系.

The bimetal complexes supported on styrene-acrylic acid copolymer (SAAC.Nd.Na. and SAAC.Nd.Fe) have been presence of a new type catalyst system composed of these complexes has been studied. We have found that the system activity is optimum when Nd and free function group -COOH molar ratio in the bimetal complexes is lower. For SAAC.Nd.Fe the system activity decreases gradually with increasing the Fe content. For SAAC.Nd.Na metal Na can promote the system activity, no matter whether the content of Na in the bimetal complexes is much or little. Only when the molar ratio of Nd to -COOH is lower, the activity increase is greater. In addition, the activity of the putadiene polymerization catalyzed by SAAC.Nd.Fe-AlEt Cl-Al(i-Bu) in the presence of phenanthroline and the relationship between the polybutadiene microstructure obtained with the content of Fe in SAAC.Nd.Fe were studied.