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Keywords:

  • polyamides;
  • polyesters;
  • blends;
  • interchange reactions;
  • compatibilization

Abstract

Finely dispersed blends of polyamide 6 (PA-6) and poly(ethylene terephthalate) (PET) were obtained by direct injection molding throughout the full composition range. The blends comprised a probably pure PA-6 phase, and a PET phase that was apparently pure in PET-rich blends and contained slight reacted PA-6 amounts in PA-6-rich blends. This very complex morphology was characterized by the presence of dispersed particles at three levels and by a very large interface area/dispersed phase volume ratio. The linear ductility behavior was attributed to both the presence of reacted copolymers and the large interface area/dispersed volume ratio, and the synergism in both the Young's modulus and yield stress to the increased orientation of the blends related to that of the pure components. © 2005 Wiley Periodicals, Inc. J Appl Polym Sci 97: 564–574, 2005