ROK为助引发剂的丁二烯调聚动力学研究

Research on polymerization kinetics of liquid polybutadiene using potassium mixed methylphenoxide as promoter

对以正丁基锂(n-BuL i)为引发剂、混甲基苯酚钾(ROK)为助引发剂、二甲苯为溶剂兼做链转移剂、二乙二醇二甲醚(2G)为极性调节剂的丁二烯阴离子调聚动力学进行了研究.考查了n(K)/n(L i)、n(2G)/n(L i)和温度对聚合速率的影响及不同条件对液体聚丁二烯相对分子质量(Mr)和相对分子质量分布(PD)的影响.实验结果表明:反应速率与单体浓度呈一次方关系;当n(K)/n(L i)、n(2G)/n(L i)增大,温度升高时,聚合反应表观增长速率常数增大;随n(K)/n(L i)的增加,聚合物相对分子质量下降,且分布加宽.所得液体聚丁二烯可用做绿色涂料基料.

Polymerization kinetics of the anionic telomerization of butadiene with n-BuLl as the initiator, potassium mixed methylphenixied （ROK） as the promoter, xylene as the transfer agent as well as the solvent in the presence of diethylene glycol dimethyl ether （2G） as the polar modifier was studied. Effect of the promoter/initiator [n（K）/n（Li）], the polar modifier/initiator [n（2G）/n（Li）] and temperature on polymerization were investigated. Influence of different reaction conditions on molecular weight and its distribution was examined. It is determined that the polymerization rate is the first-order in monomer concentration~ raising n（K）/n（Li）, n（2G）/n（Li） and temperature all resulted in the increasing of the false first-order apparent rate constant of propagation. The liquid polybutadiene obtained can be used for the base of green dope.