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Citation: WANG Xiao-Wen, ZHOU Zheng-Fa, REN Feng-Mei, WANG Jin, MA Hai-Hong, XU Wei-Bing. Deblocking Kinetics of Water-Solubility Blocked Isophorone Diisocyanate[J]. Acta Physico-Chimica Sinica, ;2009, 25(11): 2181-2185. doi: 10.3866/PKU.WHXB20091022 shu

Deblocking Kinetics of Water-Solubility Blocked Isophorone Diisocyanate

1.
School of Chemical Engineering, Hefei University of Technology, Hefei 230009, P. R. China

Received Date: 27 May 2009
Available Online: 1 September 2009

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.
- Dynamics,
- Blocked isocyanate monomer,
- Deblocking,
- Thermal stability
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