酚钾盐为助引发剂的液体聚丁二烯调聚动力学

对以正丁基锂为引发剂、对甲基苯酚钾为助引发剂、二甲苯为溶剂兼作链转移剂、2G为极性调节剂的丁二烯阴离子调聚动力学进行了研究.考察了不同n(K)/n(Li)、n(2G)/n(Li)和温度对聚合的影响.结果表明,反应速率与单体浓度呈一次方关系,n(K)/n(Li)、n(2G)/n(Li)增大、温度升高,聚合反应表观增长速率增大,考察了不同条件对聚合物分子量及微观结构的影响.制得的液体聚丁二烯调聚物可用作绿色涂料的原料.

Polymerization Kinetics of Liquid Polybutadiene Using Potassium Para-Methylphenoxide as Promoter

In this communication, polymerization kinetics of the anionic telomerization of butadiene with n-BuLi as the initiator, potassium para-methylphenoxide (ROK) as the promoter, xylene as the transfer agent as well as the solvent in the presence of diglycoldimethylether (2G) as the polar modifier was studied. Effects of n(K)/n(Li), n(2G)/n(Li) and temperature on polymerization were investigated. It is determined that polymerization rate is first-order in monomer concentration. Raising n(K)/n(Li), n(2G)/n(Li) and temperature all resulted in increasing of the false first-order apparent rate constant of propagation. Influence of different reaction conditions on the molecular weight and microstructure of the produced polymer is examined. Liquid polybutadiene produced this way can be used as material for green coating.