The effects of temperature and initiator on the curing kinetics of unsaturated polyester resins at 30-50°C were studied by d.s.c, and i.r. spectroscopy over the whole conversion range. It was found that at the beginning of reaction, the kinetic mechanism was dominated by near-azeotropic copolymerization, while styrene conversion became much more favourable than that of polyester C=C bonds later in the reaction. The transition point of the near-azeotropic copolymerization and the crosslink length of styrene varied with the concentrations of initiator and promoter used. The experimental results have been explained by a kinetic model relating to microgels.
Посилання на статтю:
Curing of unsaturated polyester resins. Effects of temperature and initiator: 1. Low temperature reactions / Yan-Jyi Huang* and Jiing-Shing Leu // Polymer. – 1993. – Vol 34. – P. 295-304.