摘要
用一系列不同结构的低聚物多元醇与4,4′-二苯基甲烷二异氰酸酯(纯MDI)进行本体聚合,比较了低聚物多元醇的结构单元、相对分子质量以及官能度等因素对绝热反应温度变化曲线的影响,同时用线性优化方法求取了它们的反应动力学参数。结果表明,含有极性较大的结构单元的低聚物多元醇,反应活化能较大;低聚物多元醇的反应速率受温度影响明显;由相同结构单元构成低聚物多元醇,相对分子质量较小的反应速率较大;适当提高低聚物多元醇官能度,可显著提高反应速率。
The polymerizations were carried out by oligomer polyols of different structures reacting with 4,4＇-di- phenylmethylene diisocynate （MDI）. Compared the effects of structure, molecular weight and functionality of oligomer polyol on adiabatic reaction kinetics of polyurethane. Kinetic parameters were calculated through a linear optimization technique. The result showed that polar group could raise activation energy. Reaction rate of these oligomer polyol with MDI could be affected by reaction temperature significantly. Oligomer polyol with lower molecular weight had higher reaction rate compared with others in similar structure. Functinality could affect reaction rate in certain range.
出处
《聚氨酯工业》
北大核心
2011年第1期12-15,共4页
Polyurethane Industry
关键词
聚氨酯
低聚物多元醇
绝热温度变化
反应动力学
polyurethane
olgomer polyol
thermal insulation temperature change
reaction kinetic
