窄分子量分布液体乙丙橡胶的制备

Preparation of liquid ethylene propylene rubber with narrow molecular weight distribution

对配位链转移聚合制备的丁异戊共聚物进行氢化,得到不同丁异戊组成比、不同氢化程度的窄分子量分布液体乙丙橡胶。结果表明,聚丁二烯链节比聚异戊二烯链节更容易氢化,通过改变对甲苯磺酰肼的用量,双键的氢化程度可实现大范围调控,得到不同饱和度的乙丙橡胶。通过对残余双键的氧化,可实现对乙丙橡胶的官能化改性。

Liquid ethylene propylene copolymer is an important pro-duct which is widely utilized as lubricant,plasticizer and so on.At present,most of such type copolymers were prepared by thermal cracking strategy,which inherently resulted in poorly controlled molecular weight and broad polydispersity.As an alternative,hydrogenation of poly(butadiene-co-isoprene)was another effective approach to access ethylene propylene copolymers.In our previous reports,we discovered a new neodymium-promoted living/controlled diene polymerization technique coordinative chain transfer polymerization(CCTP)to prepare polydienes with well-controlled molecular weights and narrow molecular weight distribution(PDI).As a continuous research,the present study disclosed the hydrogenation of poly(butadiene-co-isoprene)s obtained from CCTP to access narrow PDI ethylene propylene copolymers.