镍系催化剂用于苯乙烯-异戊二烯-丁二烯三元无规共聚物的均相加氢  

Homogeneous hydrogenation of styrene-isoprene-butadiene ternary random copolymer by nickel catalysts

作　　者：薛林[1] 李杨[1] 李嵬[1] 王玉荣[1] 张春庆[1] 

机构地区：[1]大连理工大学化工学院精细化工国家重点实验室,辽宁大连116012

出　　处：《合成橡胶工业》2010年第3期203-206,共4页China Synthetic Rubber Industry

基　　金：国家自然科学基金资助项目(20674007&20774015)

摘　　要：以环烷酸镍(简称Ni)/三异丁基铝(简称Al)为催化体系,对自制的苯乙烯-异戊二烯-丁二烯三元无规共聚物(SIBR)进行加氢反应,确定了加氢反应条件,并对氢化SIBR进行了表征。结果表明,Al/Ni(摩尔比)变化时,SIBR中聚丁二烯链段的1,2-结构比1,4-结构易于加氢,聚异戊二烯链段的3,4-结构比1,4-结构更易加氢;在催化剂用量为2 mg/g、Al/Ni为7、反应温度为60℃、反应压力为4 MPa的条件下,SIBR的最高加氢度可达98%;氢化SIBR的数均分子量和重均分子量均比SIBR略有增大,分子量分布亦略有变宽,但仍呈现窄分布的特点;SIBR中聚丁二烯链段和聚异戊二烯链段均已发生氢化反应,而苯乙烯链段基本不发生氢化反应,说明该催化体系具有较高的催化活性和选择性。The self-made styrene-isoprene-butadiene ter- nary random eopolymer（SIBR） was hydrogenated with nickel naphthenate（simplified as Ni）/triisobutyl aluminum（simpli- fied as Al） catalyst system. The reaction conditions was stud- ied, and the hydrogenated SIBR was characterized. The results showed that the 1,2-unit of polybutadiene chain was easier to behydrogenated than 1,4-unit of polybutadiene chain, and 3,4-unit of polyisoprene chain was easier to be hydrogen- ated than 1,4-unit of polyisoprene chain. When the amount of Ni was 2 mg/g, A1/Ni （mole ratio） was 7, temperature was 60℃ and reaction pressure was 4 MPa, the hydrogenation degree could reach 98%. The number-average molecular weight and weight-average molecular weight of hydrogenated SIBR were slightly larger than those of SIBR, and the molecular weight distribution was a bit wider, but it still behaved as narrow distribution. The polybutadiene and polyisoprene chains in SIBR were already hydrogenated, but the polystyrene chains were not. It indicated that the catalyst system had higher catalytic activity and selectivity.

关 键 词：苯乙烯-异戊二烯-丁二烯三元无规共聚物 环烷酸镍 三异丁基铝 氢化反应 加氢度 相对分子质量 微观结构 

分 类 号：TQ330.1[化学工程—橡胶工业]