Gn. Chen et Kn. Chen, SELF-CURING BEHAVIORS OF SINGLE PACK AQUEOUS-BASED POLYURETHANE SYSTEM, Journal of applied polymer science, 63(12), 1997, pp. 1609-1623
A di- or triaziridinyl compound served as the latent curing agent for
the prepared carboxylic groups containing aqueous-based polyurethane (
PU) dispersions. It was formulated as a single pack self-curable aqueo
us-based PU system. This system was stable under an alkaline environme
nt and its curing reaction could be initiated by a pH control. A model
reaction between a monoaziridinyl compound and formic acid was demons
trated and identified by infrared spectrophotometry. The stabilities o
f this convenient one-package PU system with a different dosage of di-
or triaziridinyl latent curing agent were monitored by a particle siz
er and fluorescence spectroscopy. The PU films were cast and self-cure
d from these single pack PU dispersions at ambient temperature. The ph
ysical and mechanical properties as well as thermal behaviors of each
self-cured PU were evaluated. (C) 1997 John Wiley & Sons, Inc.