二苯甲烷二异氰酸酯(MDI)聚合反应动力学研究  

Study on Polymerization Kinetics of Methylene Diphenyl Diisocyanate

作　　者：张琴花[1,2] 李会泉[1] 柳海涛[1] 

机构地区：[1]中国科学院过程工程研究所绿色过程工程实验室湿法冶金清洁生产技术国家工程实验室,北京100190 [2]中国科学院研究生院,北京100049

出　　处：《化学学报》2011年第6期605-609,共5页Acta Chimica Sinica

基　　金：国家科技支撑项目(No.2006BAC02A08);中科院知识创新重要方向性项目(No.KGCX2-YW-215-2)资助项目

摘　　要：采用TG-DSC-DTG技术研究了二苯甲烷二异氰酸酯(MDI)在流动高纯氮气中的聚合反应动力学.利用Flynn-Wall-Ozawa法进行了非等温动力学计算,得到了MDI聚合反应的动力学参数,通过Satava-Sestak法、Coats-Redfern法对不同机理模型进行选取,确定了MDI聚合反应的机理为随机成核和随后生长模型,机理函数为G(α)=[-ln(1-α)]1/2.由以上三种方法计算结果表明:MDⅠ聚合反应的表观活化能E=58.42 kJ·mol-1,指前因子A=5006 min-1,动力学方程为:[-l n(1-α)]1/2=5 006×exp(-58.42×1000/8.314×T)t.The polymerization processes of methylene diphenyl diisocyanate（MDI） had been studied in flow atmosphere of high purity N2 using TG-DSC-DTG techniques.The kinetic parameters of the polymeri-zation process were calculated through the Flynn-Wall-Ozawa method and the polymerization mechanism of MDI was also studied with the Satava-Sestak and Coats-Redfern methods.The results indicated that： the process calculated could be attributed to the mechanism of random nucleation and subsequently growth,with the mechanism function being G（α）= [-ln（1-α）]1/2.The activation energy and pre-exponential factor were E=58.42 kJ/mol and A=5006 min-1,the kinetic equation may be expressed as： [-ln（1-α）]1/2= 5006 × exp（-58.42×1000/8.314×T）t.

关 键 词：二苯甲烷二异氰酸酯 聚合 动力学 机理 

分 类 号：O631.5[理学—高分子化学]