摘要
以六亚甲基亚胺锂(LHMI)与二乙烯基苯(DVB)合成的氮官能化多锂(简称Li)为引发剂,N,N,N′,N′-四甲基乙二胺(TMEDA)为极性调节剂,环己烷为溶剂,制备了带有氮官能化基团的星形无规苯乙烯-异戊二烯-丁二烯共聚物(SIBR),用核磁共振法进行了表征,并分析了TMEDA用量、聚合温度、引发剂浓度及DVB/Li(摩尔比)对SIBR微观结构和玻璃化转变温度(Tg)的影响。结果表明,在DVB/LHMI(摩尔比)为0.8的条件下,SIBR中有C—N存在,并且为臂数不等的星形聚合物;随着TMEDA用量的增加和聚合温度的降低,SIBR中非1,4-结构含量增加,Tg提高;在实验范围内引发剂浓度和DVB/Li对SIBR中非1,4-结构含量和其Tg影响不大。
A novel star-shaped styrene-isoprenebutadiene copolymer（SIBR） was prepared with nitric-functionalized multilithium （N-multi-Li） as initiator synthesized by the reaction of LHMI with divinylbenzene （ DVB ） , N, N, N＇, N＇-tetramethylethylenediamine（TMEDA） as polar modifier and cyclohexane as solvent. The microstructure was characterized by nuclear magnetic resonance. Effects of different TMEDA dosage, polymerization temperature, initiator concentration and DVB/Li （mole ratio） on the microstructure and glass transition temperature （Tg） were studied. The results showed that SIBRwas a multi-arm star-shaped polymer and had C--N group under the condition of DVB/LHMI （mole ratio） 0. 8. The non-1,4-structure content and Tg increased with increasing TMEDA dosage or decreasing polymerization temperature, and the effects of initiator concentration and DVB/Li were inconspicuous.
出处
《合成橡胶工业》
CAS
CSCD
北大核心
2007年第3期175-178,共4页
China Synthetic Rubber Industry
关键词
氮官能化多锂
负离子聚合
星形
苯乙烯-异戊二烯-丁二烯共聚物
微观结构
玻璃化
转变温度
N-functionalized multilithium
anion-ic polymerization
star-shaped
styrene-isoprene-bu-tadiene copolymer
microstructure
glass transitiontemperature
