【摘要】 <正> 在钼体系合成1,2-聚丁二烯的研究中,围绕催化活性的问题作了不少工作,但主、助催化剂的匹配至今尚处于经验阶段,钼的活性价态还不清楚。因此,本工作以烷氧基钼作主催化剂,各种烷基铝作助催化剂,结合聚合反应,利用电子自旋共振波谱(ESR)对烷基铝的还原性能和钼的活性价态作一初步探讨。更多还原

【Abstract】 The effect of various aluminium alkoxides in match with the same molybdenum alkoxide on the activity in the polymerization of butadiene has been studied. The order of activity of R2AlOR’ with varied R is as follows:(i-Bu)2AlOPh > Et2AlOPh ≥ Me2AlOPh, when R’ = Ph; (i-Bu)2AlOC8Hl7 > Et2AlOC8H17, when R’ = C8H17. The order of activity of R2AlOR’ with avried R’ is as follows:(i-Bu)2AlOPh > (i-Bu)2AlOC8H17, when R = i-Bu; Et2AlOPh > Et2AlOC8Hl7, when R = Et.The active valence state of molybdenum as determined by ESR is three.更多还原