Abstract
A new one-shot method for the preparation of urethane elastomers has been developed using the reaction of glycols and diisocyanates in the presence of triethylene diamine together with epoxy resin as a polyaddition catalyst.
As the glycol component, binary mixtures of polypropylene glycol and low molecular weight glycols were used.
In this way, elastomers of high moduli can be prepared by curing at 70 °C without preliminary treatment.
Ethylene glycol causes an increase in the amount of diisocyanate to be incorporated and as a result, the moduli of the elastomers are much enhanced through the formation of isocyanurate linkage or hydrogen bonding.
The presence of epoxy resin may promote the catalytic action of triethylene diamine.
