【摘要】 研究了Nd（naph）₃-Al（i-Bu）₂H-t-BuCl（或allyl-Cl）催化体系制得的顺丁橡胶（BR）的结构与性能。结果表明,[η]=2.7～3.7dL/g,分子量分散指数小于4,[η]<1低分子级分含量小于50％,顺式-1,4含量大于或等于95％时,其生胶、混炼胶和硫化胶的性能均良好,硫化胶的综合性能与一般稀土体系BR和镍系BR相当甚至超过。更多还原

【Abstract】 Two types of cis-polybutadiene rubbers (BR) were prepared by using two novel homogeneous rare earth catalyst systems Nd(naph)-Al(i-Bu)2H-t-BuCl or -allyl-Cl, with hexane as solvent in a 1 L polymerization reactor .The ef fects of intrinsic viscosity [η] , molecular weight distribution (D) and cis -1,4 content of BR on the properties of raw rubber , compounds and vulcanizates were investigated. The results showed that when [η] was in the range of 2.7 to3.7 dL/g , D<4 ,low molecular weight fraction ([η]<1) was less than 50% and cis -1,4 content more than 95% , these two BRs had better mechanical properties as compared with the BRs prepared by nickel catalyst system or general rare earth catalyst system .更多还原