Curing reaction kinetics of HTPE polymer studied by simultaneous rheometry and FTIR measurements

摘要

In order to study the curing reactions of hydroxyl-terminated polyether (HTPE) with a curing agent hexamethylene diisocyanate biuret (HDIB), the rheology and chemical processes of the curing reactions have been studied by simultaneous rheometry and FTIR spectroscopy. It was shown that the gel point was a key parameter in the curing reaction of HTPE with HDIB. The gel point was at the intersection of G' and GaEuro(3) curves. The gel point was when gelation occurred. After gelation, the polymer could not flow and the viscosity and real modulus increased rapidly. The curing reaction of the HTPE/HDIB kinetics system, monitored by an FTIR technique, showed a characteristic intensity peak at 2270 cm(-1), corresponding to the -N=C=O stretching vibration which decreased as a function of time and the curing reaction of the HTPE/HDIB system and obeyed a three-dimensional (spherical symmetric) diffusion model.