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Vol. 25 No. 10 (2013): Vol 25 Issue 10

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Study on Blocking and Deblocking Kinetics of Diisocyanate with e-Caprolactam Using FTIR Spectroscopy

https://doi.org/10.14233/ajchem.2013.OH67
Yan-fei Tang
Anhui Key Laboratory of Advanced Building Materials, Anhui University of Architecture, Hefei 230022, P.R. China ; School of Materials Science and Chemical Engineering, Anhui University of Architecture, Hefei 230022, P.R. China
Jin Liu
Anhui Key Laboratory of Advanced Building Materials, Anhui University of Architecture, Hefei 230022, P.R. China ; School of Materials Science and Chemical Engineering, Anhui University of Architecture, Hefei 230022, P.R. China
Zhen Li
Anhui Key Laboratory of Advanced Building Materials, Anhui University of Architecture, Hefei 230022, P.R. China ; School of Materials Science and Chemical Engineering, Anhui University of Architecture, Hefei 230022, P.R. China
Bi-yun Chen
School of Materials Science and Chemical Engineering, Anhui University of Architecture, Hefei 230022, P.R. China
Sheng-fu Mei
School of Materials Science and Chemical Engineering, Anhui University of Architecture, Hefei 230022, P.R. China

Corresponding Author(s) : Jin Liu

liujin@aiai.edu.cn

Asian Journal of Chemistry, Vol. 25 No. 10 (2013): Vol 25 Issue 10

Abstract

These blocking and deblocking reactions of toluene diisocyanate (TDI), diphenylmethane-4,4'-diisocyanate (MDI) and dicyclohexylmethylmethane-4,4'-diisocyanate (HMDI) blocked with e-caprolactam were directly traced by FTIR spectroscopy at different temperatures respectively. Taking advantage of the relationship between the concentration of reactants and absorbance of NCO group according to Lambert-Beer law, the change with time for concentration was calculated under different temperatures. The results showed that the reaction rate constants for toluene diisocyanate, MDI blocked with e-caprolactam were 4.05 × 10-3 and 6.53 × 10-2 at 60 ºC respectively, while the reaction rate constant for HMDI with catalyst was 3.56 × 10-3 at 140 ºC, the class of reaction kinetics for diisocyanate (TDI and MDI) blocked with e-caprolactam were first order and second order respectively and the reaction of blocked HMDI was second order reaction selecting stannous octoate as catalyst. The Arrhenius equation was employed to acquire the activation energies of blocked diisocyanate (TDI, MDI and HMDI) respectively. The process of deblocking for blocked diisocyanate was also studied by TGA and FTIR.

Keywords

Diisocyanate e-Caprolactam Blocking and Deblocking Reaction kinetics
Tang, Y.- fei, Liu, J., Li, Z., Chen, B.- yun, & Mei, S.- fu. (2013). Study on Blocking and Deblocking Kinetics of Diisocyanate with e-Caprolactam Using FTIR Spectroscopy. Asian Journal of Chemistry, 25(10), 5703–5706. https://doi.org/10.14233/ajchem.2013.OH67
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