石油化工2018，Vol.47Issue(5)：480-485,6.DOI:10.3969/j.issn.1000-8144.2018.05.014
超支化聚氨酯多元醇的反应动力学
Reaction kinetics of hyperbranched polyurethane polyol
摘要
Abstract
A hydroxyl terminated hyperbranched polyurethane polyol(HBPU) was prepared with isophorone diisocyanate and trimethylolpropane as monomers by solution polymerization in the absence of catalyst,and kinetic study was performed on the reaction by a dibutylamine titration method. The experimental results showed that the reaction of the HBPU was divided into two steps,i.e.,a pre-polymerization reaction and a polymerization reaction. The optimum conditions for the pre-polymerization reaction were n(NCO):n(OH) 2:1,reaction temperature of 80 ℃ and reaction time of 1 h. The optimum conditions for the polymerization reaction were n(NCO):n(OH) 1:3,reaction temperature of 80 ℃ and reaction time of 2 h. The pre-polymerization reaction of the HBPU kinetically followed a second-order reaction with the reaction activation energy being 71.4 kJ/mol,and the polymerization reaction kinetically followed a third-order reaction with the reaction activation energy being 51.1 kJ/mol. The activation energy of the polymerization reaction was less than the activation energy of the pre-polymerization reaction,so temperature had greater influence on pre-polymerization. With no catalyst,the autocatalytic effect of carbamates played an important role in the polymerization reaction of the HBPU.关键词
超支化聚氨酯多元醇/反应动力学/滴定法/自催化Key words
hyperbranched polyurethane polyol/reaction kinetics/titration/autocatalysis分类
化学化工引用本文复制引用
罗玉梅,叶仲斌,白小东,周松..超支化聚氨酯多元醇的反应动力学[J].石油化工,2018,47(5):480-485,6.基金项目
国家自然科学基金青年基金项目(51104122) （51104122）
四川省教育厅科技基金项目(15ZB0059) （15ZB0059）
四川省高等学校油气田材料重点实验室开放基金项目(X151517KCL45). （X151517KCL45）
