【作者】 贯璟； 陈锋； 宋义虎； 殷先泽； 刘凉冰； 郑强；

【Author】 Guan Jing~1,Chen Feng~1,Yin Xianze~1,Song Yihu~1,Liu Liangbing~2,Zheng Qiang~(1*) (1 Department of Polymer Science and Engineering,Zhejiang University, Hangzhou,310027 2 Shanxi Provincial Institute of Chemical Industry,Taiyuan,030021)

【机构】 浙江大学高分子科学与工程学系； 山西省化工研究所；

【摘要】 <正>以二苯基甲烷二异氰酸酯(MDI)与聚醚多元醇为原料的聚氨酯预聚反应,是制备单组分混固化聚氨酯密封胶的重要步骤之一。液化MDI(又称碳化二亚胺改性MDI)是MDI的重要改性品种,其碳化二亚胺组分可抑制二聚体生成,提高产品的耐水解性。文献很少涉及液化MDI与多元醇制备聚氨酯预聚体的反应动力学。本文用非等温法测量了该体系的DSC曲线,并采用n级反应模型分析动力学数据,得到动力学参数。更多还原

【Abstract】 Reaction kinetics of polymerization of liquefied MDI/polyethylene glycol was studied using differential scanning calorimetry(DSC) under nonisothermal conditions to define its reaction temperature and activation energy.The data were fitted to Kissinger,Ozawa,Friedman models to determine reaction activation energy.According to Friedman model,activation energy decreased with increasing reaction degree,suggesting that the kinetics was determined by competition of chemical reaction and molecular diffusion.更多还原