Abstract
Super-tough poly(butylene terephthalate) (PBT) based blends were obtained by melt blending PBT with 20 wt% poly(ethylene-octene) copolymer (PEO), and varying amounts of poly(ethylene-co-glycidyl methacrylate) (EGMA) as a compatibilizer. Partially reacted EGMA dissolved completely, mainly in the PBT-rich phase, up to 4% EGMA, at which point a crystalline EGMA phase appeared. The reaction and the consequent compatibilization led to a decrease in the particle size and to an improvement in the adhesion between the components. Two percent EGMA was the minimum content required to reach maximum super-toughness, that also corresponded to the maximum ductility. The inter-particle distance (τ) was the parameter that controlled super-toughness. The study of the parameters that τc depends on, showed that τc was independent of the modulus of the dispersed phase (Ed) over the τc range studied. However, the dependence of τc on adhesion at the interphase was seen by means of the comparison of the τc-interfacial tension relationship of this blend with those of previous studies.
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