Functionalized elastomeric compatibilizer in PA 6/PP blends and binary interactions between compatibilizer and polymer

R. M. Holsti-Miettinen, J. V. Seppälä, O. T. Ikkala, I. T. Reima

    Research output: Contribution to journalArticleScientificpeer-review

    80 Citations (Scopus)

    Abstract

    Superior impact properties were obtained when maleic anhydride grafted styrene ethylene/butylene styrene block copolymer (SEBS-g-MAH) was used as a compatibilizer in blends of polyamide 6 (PA 6) and isotactic polypropylene (PP), where polyamide was the majority phase and polypropylene the minority phase. The optimum impact properties were achieved when the weight relation PA:PP was 80:20 and 10 wt% SEBS-g-MAH was added. Then blend morphology was systematically investigated. Transmission electron microscopy (TEM) indicated that the compatibilizer forms a cellular structure in the PA phase in addition to acting as an interfacial agent between the two polymer phases. In this cellular-like morphology the compatibilizer appears to form the continuous phase, while polyamide and polypropylene form separate dispersions. In microscopy, PA appeared as a fine dispersion and PP as a coarse dispersion. The mechanical properties indicated that in fact PA, too is continuous, and the blend can be interpreted as possessing a modified semi-interpenetrating network (IPN) structure with separate secondary dispersion of PP. The coarser PP dispersion plays an essential role in impact modification. Binary blends of the compatibilizer and one blend component were also investigated separately.

    Original languageEnglish
    Pages (from-to)395-404
    Number of pages10
    JournalPolymer Engineering and Science
    Volume34
    Issue number5
    DOIs
    Publication statusPublished - Mar 1994
    MoE publication typeA1 Journal article-refereed

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