摘要
采用配位聚合引发体系环烷酸钴(简称Co)-三异丁基铝(简称Al)-二硫化碳(CS2)引发异戊二烯聚合制得3,4-聚异戊二烯(PIp),考察了聚合条件对单体聚合活性的影响,通过凝胶渗透色谱、核磁共振氢谱和差示扫描量热法表征了3,4-PIp的相对分子质量及其分布、微观结构及玻璃化转变温度(Tg).结果表明,在Co/Ip(摩尔比)为4.0×10-4、Al/Co(摩尔比)为55~65、CS2/Co(摩尔比)为15、聚合温度为40 ~ 50℃的条件下合成了3,4-结构(含1,2-结构)摩尔分数约为80%的非结晶材料PIp,其数均分子量为3.4×104,分子量分布指数为1.8,Tg为-6.5℃.
The 3,4-polyisoprene (PIp) was synthesized by liquid bulk polymerization of isoprene (Ip) with cobalt naphthenate(simplied as Co) /A1 (iBu)3 (simplied as Al) /CS2 catalytic systems,and the influence of process conditions on polymerization activity of monomer was investigated,and the relative molecular mass and its distribution,microstructure and glass-transition temperature (Tg) were characterized by gel permeation chromatography,1 H-nuclear magnetic resonance and differential scanning calorimetry.The results showed that under the optimum polymerization condition of Co/Ip (mole ratio) 4.0 × 10-4,Al/Co(mole ratio) 55-65,CS2/Co(mole ratio) 15 and 40-50 ℃,the 3,4-PIp with 80% mole fraction of 3,4-unit (including 1,2-unit) was obtained,the number-average molecular weight and its polydispersion index were 3.4 × 104,1.8 respectively,and Tg was-6.5℃.
出处
《合成橡胶工业》
CAS
CSCD
北大核心
2013年第6期433-436,共4页
China Synthetic Rubber Industry
基金
国家自然科学基金资助项目(51273100)
关键词
环烷酸钴
三异丁基铝
二硫化碳
配位聚合
3
4-聚异戊二烯
催化效率
相对分子质量
微观结构
cobalt naphthenate
triisobutylaluminum
carbon disulfide
coordination polymerization
3,4-polyisoprene
catalytic efficiency
relative molecular mass
microstructure
作者简介
作者简介:陈冬梅(1972-),女,山东济南人,硕士研究生,高级工程师.从事橡塑材料合成与表征方面的研究,已发表论文10余篇,获青岛市科技进步一等奖1项.
通讯联系人。