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Three‐group type mechanism in the curing behavior of polyacrylate and blocked toluene diisocyanate
Author(s) -
Xiao Dequan,
Chen Deben,
Zhou Zonghua,
Zhong Anyong
Publication year - 2001
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/app.2233
Subject(s) - toluene diisocyanate , curing (chemistry) , polymer chemistry , toluene , molecule , fourier transform infrared spectroscopy , hydrogen bond , chemistry , materials science , polyurethane , organic chemistry , chemical engineering , engineering
The curing behavior of two resins, five blocked toluene diisocyanate (TDI) crosslinkers and polyacrylate, was studied using Torsional Braid Analysis (TBA) to examine their dynamic mechanical properties. The curing process was clearly divided into two stages. Associated with data from in situ FTIR at the molecular level, the first stage was the reaction of deblocked NCO and hydroxyl in polyacrylate. In the second stage, the deblocked NCO attacked the hydrogen in NH group of the urethane bond to conduct deep curing. Computer modeling was used to investigate the lowest‐energy configuration of the crosslinker molecule. The space hindrance effect in the molecule causes this type of three‐group crosslinking curing mechanism in the blocked TDI crosslinker. © 2002 John Wiley & Sons, Inc. J Appl Polym Sci 83: 112–120, 2002