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Curing behavior of acrylate–urethane system
Author(s) -
Chen Deben,
Qi Xu,
Zhou Zonghua,
Zhong Anyong,
Du Zougying
Publication year - 1996
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/(sici)1097-4628(19961205)62:10<1715::aid-app23>3.0.co;2-z
Subject(s) - isocyanate , diethanolamine , polymer chemistry , curing (chemistry) , copolymer , acrylate , fourier transform infrared spectroscopy , differential scanning calorimetry , materials science , chemistry , polyurethane , chemical engineering , polymer , organic chemistry , composite material , physics , engineering , thermodynamics
The curing behavior of a two‐component system—acrylate copolymer I (the main resin) and monobutyl glycol ether and diethanolamine blocked 2,4‐toluene diisocyanate II (the crosslinker)—was studied by torsional braid analysis (TBA), Fourier transform infrared (FTIR), and differential scanning calorimetry (DSC). The results show that the curing process consists of two steps: First, the hydroxyl‐blocked isocyanate group (NCO) thermally dissociates to produce a free isocyanate group, which can react with the hydroxyl of the acrylate copolymer. Second, the amino‐blocked isocyanate thermally dissociates and regenerates a free isocyanate group which can react with the hydroxyl group of the acrylate copolymer. Thus, the crosslinked network is obtained. When the organotin catalyst was added into the system, the curing temperature and the curing time was shortened efficiently. The Arrhenius apparent activation energy for curing was calculated in this study. © 1996 John Wiley & Sons, Inc.