物理化学学报 >> 2009, Vol. 25 >> Issue (11): 2181-2185.doi: 10.3866/PKU.WHXB20091022

研究论文 上一篇    下一篇

水溶性封闭异氰酸酯单体的解封动力学

王晓文, 周正发, 任凤梅, 汪瑾, 马海红, 徐卫兵   

  1. 合肥工业大学化工学院, 合肥 230009
  • 收稿日期:2009-05-27 修回日期:2009-07-15 发布日期:2009-10-28
  • 通讯作者: 徐卫兵 E-mail:xwb105105@sina.com

Deblocking Kinetics of Water-Solubility Blocked Isophorone Diisocyanate

WANG Xiao-Wen, ZHOU Zheng-Fa, REN Feng-Mei, WANG Jin, MA Hai-Hong, XU Wei-Bing   

  1. School of Chemical Engineering, Hefei University of Technology, Hefei 230009, P. R. China
  • Received:2009-05-27 Revised:2009-07-15 Published:2009-10-28
  • Contact: XU Wei-Bing E-mail:xwb105105@sina.com

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摘要：

采用热失重分析(TGA)法研究了水溶性封闭型异佛尔酮二异氰酸酯(IPDI)的热分解过程, 利用傅里叶变换红外光谱法(FTIR)考察了谱图中40 与140 ℃两种温度下的异氰酸酯特征峰. TGA与FTIR的结果表明失重阶段即对应封闭异氰酸酯的解封闭反应. 用Friedman-Reich-Levi (FRL)和Flynn-Wall-Ozawa (FWO)两种动力学模型研究了解封反应的表观活化能E, 所得平均表观活化能分别为125.0和124.5 kJ·mol-1. 采用双等双步法对解封过程进行表观机理函数判断, 结果符合Jander方程, 反应机理为三维扩散, 结合FWO方程确定了反应级数n和指前因子对数lnA的范围.

关键词: 动力学, 封闭异氰酸酯单体, 解封, 热稳定性

Abstract:

The thermal decomposition process of water-solublity blocked isophorone diisocyanate (IPDI) was studied using thermal gravimetric analysis (TGA). The characteristic peaks of isocyanante groups at 40 and 140 ℃ were observed by Fourier transform infrared spectroscopy (FTIR). Results from TGA and FTIR showed that the degradation stage was a deblocking reaction of the blocked adduct. The Friedman-Reich-Levi (FRL) and Flynn-Wall-Ozawa (FWO) models were employed to investigate the apparent activation energies which were 125.0 and 124.5 kJ·mol-1, respectively. Based on the double equal-double step method, the reaction was analyzed by the apparent mechanism of the process of deblocking according to the Jander equation, which indicated that the reactive mechanism was a three-dimensional diffusion. The reaction order (n) and the logarithm of pre-exponential factor (lnA) were also determined using the FWO equation.

Key words: Dynamics, Blocked isocyanate monomer, Deblocking, Thermal stability