Acta Phys. -Chim. Sin. ›› 2009, Vol. 25 ›› Issue (11): 2181-2185.doi: 10.3866/PKU.WHXB20091022

• ARTICLE • Previous Articles     Next Articles

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

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

MSC2000: 

  • O642