摘要
Abstract
Liquid polybutadiene rubber(LBR)was synthesized by anionic polymerization method using n-butyllithium as an initiator,polar compounds as modifiers,and 1,3-butadiene as a monomer.The effects of polymerization conditions,polarity regulator,and complex regulation system on monomer conversion rate,microstructure,and molecular weight of LBR were investigated by using FTIR,1H NMR,and GPC.The experimental results demonstrate that low temperatures are conducive to the ethyltetrahydrofurfuryl alcohol ether(ETE)regulation system to enhance the 1,2-configuration ratio of LBR.When ETE content is 1 000 mg/L,the regulation ability of the regulation system for 1,2-configuration is the strongest.Furthermore,the sodium tert-butoxide/ETE complex system can enhance the monomer conversion rate and the 1,2-configuration ratio of LBR.The complex regulation system of σ/μ type ligands demonstrates a superior regulation ability to 1,2-configuration of LBR.The introduction of ETE into the cycloheximide/ETE complex system has a markedly high complexation-decoupling effect on the active center of the lithium carbon bond.Consequently,the σ/μ type complex system represents a promising and efficient approach for structural regulation of lithium-based LBR.关键词
液体聚丁二烯橡胶/叔丁醇钠/1,2-构型Key words
liquid polybutadiene rubber/sodium tert-butoxide/1,2-configuration分类
化学化工
