TDI-TMP预聚物的结构表征及反应动力学

发布时间：2018-03-21 19:00

  本文选题：甲苯二异氰酸酯　切入点：三羟甲基丙烷　出处：《华南理工大学学报(自然科学版)》2017年06期 　论文类型：期刊论文

【摘要】：采用红外光谱、核磁共振、高分辨质谱对甲苯二异氰酸酯(TDI)与三羟甲基丙烷(TMP)反应预聚物进行表征,并通过高效液相色谱-质谱联用追踪反应中各低聚物中间体的含量,研究TDI和TMP的反应动力学.研究表明:TDI-TMP加成反应为二级反应;温度对TDI中2位和4位—NCO的反应选择性有显著影响,反应温度从50℃升高到80℃,2位—NCO选择性从0.41增加到0.64;在80℃下,三步反应的反应速率常数分别为0.185 40、0.037 89和0.011 40 mol~(-1)·L~(-1)·min~(-1),活化能分别为12.76、16.58和25.63 k J/mol,反应第三步较前两步对温度更加敏感,故反应后期适当提高温度有利于反应的充分进行.
[Abstract]:The prepolymer of toluene diisocyanate (TDI) and trimethylolpropane (TMP) was characterized by IR, NMR and high resolution mass spectrometry, and the content of oligomer intermediates in the reaction was tracked by HPLC / MS. The reaction kinetics of TDI and TMP was studied. The results show that the addition reaction of TDI-TMP is a second-order reaction, and the temperature has a significant effect on the selectivity of 2-and 4-position -NCO reaction in TDI. The selectivity of -NCO was increased from 0.41 to 0.64 at reaction temperature from 50 鈩，

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