以氯代钒酸酯-三异丁基铝催化体系合成丁二烯-丙烯交替共聚物的研究

本文比较了各种氯代钒酸酯-三异丁基铝体系催化丁二烯、丙烯交替共聚的活性,得出氯代钒酸二新戊酯-三异丁基铝体系催化活性最高。能制得高分子量的交替共聚物。研究了该催化体系的特点和聚合规律及提高共聚物η]的途径。在-76--45℃温度范围内可以制得正η]为1.7-2.6dl/g的丁丙交替共聚物,单体转化率在80％以上。通过分析鉴定,证明产物交替度在95％左右,反式1,4丁二烯组分含量在95％以上。

STUDIES ON THE ALTERNATING COPOLYMERIZATION OF BUTADIENE AND PROPYLENE IN THE PRESENCE OF CHLORO-VANADATE-TRIISOBUTYLALUMINIUM CATALYST SYSTEM

The catalytic activities of various chlorp-vanadates-triispbutylalumin-ium systems in alternating copolymerization of butadiene and propylene have been compared. It was found that the catalyst system consisted of neopentylchlorovanadate-triisobutylaluminium can give .high molecular weight alternating copolymers of butadiene and propylene in high yield.The character and behavior of the alternating copolymerization and the ways for increasing η] of the copolymer have also been studied.Thus an alternating copolymer of butadiene and propylene .with inherentviscosity 1.7-2.6 dl/g was obtained at -76--45℃, the conversion ofwhich was more than 80%.The resulting copolymers were analyzed by IR and NMR, it was demonstrated that the alternating degree of the copolymers was about 95% and the content of trans-1,4 butadiene unit in the copolymers was above