摘要
采用Nd(P507)3(简称Nd)、氢化二异丁基铝(简称Al)、三氯甲烷(简称Cl)和三氯乙酸乙酯(简称ETCA)催化体系,以环己烷为溶剂,在苯乙烯(St)的存在下,实现丁二烯的选择性聚合。考察了[Al]/[Nd]和[Cl]/[Nd]比、St加入量、聚合温度等对聚合的影响。结果表明,在[Al]/[Nd]比为20、[Cl]/[Nd]比为10、[ETCA]/[Nd]比为1.0、聚合温度为50℃时,聚合物收率可达92%以上;所得聚丁二烯具有较高顺-1,4结构含量、窄分子量分布(-Mw/-Mn^2.0)和极低的苯乙烯链节含量(<0.4%)。
The selective polymerization of butadiene(Bd) in the presence of styrene was carried out in cyclohexane with the rare earth catalyst comprised of Nd(P507)3(Nd),Al(i-Bu)2H(Al),CHCl3(Cl),and CCl3COOCH2CH3(ETCA).The effects of Al/Nd and Cl/Nd molar ratios,polymerization temperature,and St feed ratio on the polymerization were investigated.The results show that polymer yield is up to 92.5% at polymerization temperature of 50 ℃,Al/Nd molar ratio of 20,Cl/Nd molar ratio of 10,and ETCA/Nd molar ratio of 1.0.The produced polymers have high cis-1,4 content,narrow molecular weight distribution(w/n ~2.0),and extremely low St content(0.4%).
出处
《高分子材料科学与工程》
EI
CAS
CSCD
北大核心
2011年第12期9-11,15,共4页
Polymer Materials Science & Engineering
基金
国家自然科学基金资助项目(20974016)
关键词
丁二烯
聚合
稀土催化剂
苯乙烯
butadiene
polymerization
rare earth catalyst
styrene