极性添加剂存在下铝-镍催化体系的苯乙烯-异戊二烯-丁二烯共聚物的氢化反应

摘要

Styrene-isoprene-butadiene terpolymer ( SIBR) was synthesized by anionic polymerization, and its structure was characterized. The effect of N,N,N'N'-tetramethylethylenediamine ( TMEDA ) , diethylene glycol di-methyl ether ( 2 G) and tetra-hiydrofuran(THF) as external additives on hydrogen-ation reaction of SIBR catalyzed with triisobutyl aluminium (simplified as Al)ickel naphthenate ( simplified as Ni) catalyst system ( mole ratio of Al to Ni 5) was studied. The results showed that the SIBR with relative molecular mass 10×10 , polydispersity index no more than 1.10 could be synthesized under the conditions of temperature 50 ℃ , the mass fraction of styrene 25% , mass fraction of isoprene andstyrene 75% (mass ratio the two 1/1) , TMEDA-BuLi(mole ratio) 1. 5. The hydrogenation reaction of SIBR was milder, the regulation and control of hydrogenation degree was more effective when polar additives TMEDA, 2 G and THF were added. In the range of additive levels in this study, the order of influencing SIBR hydrogenation degree from large to small for the three additives was TMEDA, 2 G, THF.%采用负离子聚合法合成苯乙烯-异戊二烯-丁二烯三元共聚物( SIBR),并对其结构进行了表征；研究了结构调节剂N,N,N＇,N＇-四甲基乙二胺(TMEDA)、二乙二醇二甲醚(2 G)和四氢呋喃(THF)作外加添加剂时,对三异丁基铝(简称Al)/环烷酸镍(简称Ni)体系(A1与Ni的摩尔比为5)催化SIBR氢化反应的影响.结果表明,在50℃,苯乙烯质量分数为25％、异戊二烯和丁二烯质量分数为75％(二者质量比为1/1),TMEDA - BuLi(摩尔比)为1.5的条件下,可合成相对分子质量在10×104左右、多分数指数小于1.10的SIBR；TMEDA、2G或THF极性添加剂的加入可使SIBR的氢化反应更加温和、加氢度更能有效调控；在所研究的添加剂用量范围内,3种添加剂对SIBR加氢度的影响程度由大到小依次为TMEDA、2G、THF.