Polymer Blends with Fibrillar Phase Morphology Prepared by Self-Reinforcing Technique: I. Blends of Isotactic Polypropylene and Polyamide-12

J. Varga, A. Breining, G. W. Ehrenstein

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

High-strength, high-modulus products with a characteristic phase morphology were prepared via the injection molding of blends of isotactic polypropylene (PP) and polyamide-12 (PA-12) wider special processing conditions (low melt temperature, high holding pressure, and a convergent sprue design). These conditions generated a situation in which the dispersed phase can be distributed in the self-reinforced matrix as oriented fibrils. Optical (polarized light optical and phase contrast) microscopic and SEM investigations revealed a uniform distribution of the dispersed phase within the matrix. These products can be regarded as in situ thermoplastic composites. The strength level of the self-reinforced blends is approximately twice as high as that of the products processed under conventional conditions. The PA-12 phase dispersed as ultrathin fibrils enhances the flexural impact strength of the blends, decreases their notch sensitivity, and alters its fracture mechanism.

Original languageEnglish
Pages (from-to)53-62
Number of pages10
JournalInternational Polymer Processing
Volume15
Issue number1
DOIs
Publication statusPublished - Mar 2000

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Polymers and Plastics
  • Industrial and Manufacturing Engineering
  • Materials Chemistry

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