摘要
采用二乙二醇单乙醚基钡-三异丁基铝-正丁基锂(BaDEGEE—TIBA—n—BuLi)三组分阴离子引发体系合成了不同反式1,4-聚丁二烯含量(质量分数最高可达92.1%)的高反式1,4-聚丁二烯(HTPB),HTPB的相对分子质量呈单峰分布,相对分子质量分布指数为1.35左右。考察了催化剂组分的配比(n(Ba):n(Li)和n(Al):n(Li))、聚合温度对HTPB微观结构的影响。实验结果表明,随n(Ba):n(Li)的增大,HTPB的含量增加,当n(Ba):n(Li)〉0.30时,单体转化率显著下降;随n(Al):n(Li)的增大,HTPB的含量增加,当n(Al):n(Li)〉1.00时,单体转化率明显下降;随聚合温度的降低,HTPB的含量略有增加。确定了合成HTPB的最佳工艺参数(H(Ba):n(Li)=0.20~0.40、n(Al):n(Li)=025~1.00、聚合温度60~80℃,探讨了BaDEGEE—TIBA—n—BuLi三组分阴离子引发体系合成HTPB的反应机理。
High trans-1,4-polybutadiene ( HTPB ) with different trans-1,4-polybutadiene contents (highest mass fraction 92. 1%) was synthesized by using anionic initiation system of n-butyllithium( n-BuLi), barium salt of di ( ethylene glycol ) ethylether ( BaDEGEE ) and triisobutyl aluntinum(TIBA). The effects of mole compositions in the initiation system (n(Ba) : n(Li) and n (Al) : n (Li)) and polymerization temperature on HTPB microstructure were studied in detail. HTPB content in the products increased with the increase of ratios of n (Ba) : n (Li) and n (Al) : n (Li), but the conversion of monomer decreased rapidly when n (Ba) : n ( Li ) 〉 0.30 and n ( Al ) : n ( Li ) 〉 1.00. The optimum reaction conditions were concluded as n (Ba) : n (Li) 0.20 -0.40, n (Al): n(Li) 0.25 - 1.00, and polymerization temperature 60 - 80 ℃. Preliminary polymerization mechanism was proposed.
出处
《石油化工》
CAS
CSCD
北大核心
2009年第3期316-321,共6页
Petrochemical Technology
基金
国家自然科学基金项目(20674007&20774015)
中国石油天然气集团公司创新基金项目(05E7006)
关键词
二乙二醇单乙醚基钡
三异丁基铝
正丁基锂
丁二烯
高反式1
4-聚丁二烯
阴离子聚合
barium salt of di ( ethylene glycol ) ethylether
triisobutyl aluminum
n-butyllithium
butadiene
high trans-1 ,4-polybutadiene
anionic polymerization