Binders Based on Mixtures of Epoxy Polymers and Thermoelastoplasts. Part 1. Relaxation Properties of Epoxy Polymers Modified by Polybutadieneterephtalate–Polytetramethyleneoxide Block Copolymers

Abstract: The effect of thermoelastoplasts, which are two-block statistical block copolymers of polybutylene terephthalate and polytetramethylene oxide with different ratios of rigid and elastic blocks, on the static and dynamic mechanical properties of epoxy polymers has been investigated. It has been shown by the method of dynamic mechanical analysis that the introduction of modifiers leads to a decrease in molecular mobility in a wide temperature range (220–380 K). A noticeable decrease in the value and rate of creep of epoxy composites with the introduction of a thermoplastic elastomer has been found. The observed effects may be associated with the restriction of freedom of conformational rearrangements near the interfaces of the epoxy polymer with blocks of polybutylene terephthalate and polytetramethylene oxide and an increase in the cross-linking density of the epoxy network.