三臂星形端羟基聚丁二烯的阴离子合成及其表征

Synthesis and characterization of three-arm star-shaped hydroxyl-terminated polybutadiene by means of anionic polymerization

以叔丁基二甲基硅氧基丙基锂为引发剂,环己烷为溶剂进行阴离子聚合合成三臂星形端羟基聚丁二烯。采用凝胶渗透色谱(GPC)和1H-NMR方法表征了聚合物相对分子质量及其分布、支化度、平均官能度和主链微观结构。研究结果表明,三臂星形端羟基聚丁二烯的相对分子质量分布指数≤1.1,平均官能度和支化度均接近3。

Three-arm star-shaped hydroxyl-terminated polybutadiene has been synthesized by means of anionic polymerization,using alkyllithium containing silicon-protected hydroxyl group as initiator and cyclohexane as solvent.Molecule weight and molecule weight distribution,the degree of branching,average functionality and main-chain microstructure were characterized by GPC and 1H-NMR.The results show that three-arm star-shaped hydroxyl-terminated polybutadiene via anionic polymerization has narrow molecular weight di...