Real-time morphological observation of isotactic polypropylene and poly(ethylene-co-octene) rubber blend during temperature change

Michio Ono, Ken Nakajima, Mayumi Misawa, Toshio Nishi

    Research output: Contribution to journalArticlepeer-review

    2 Citations (Scopus)

    Abstract

    In the injection- and compression-molded specimens composed of isotactic polypropylene (iPP) and poly(ethylene-co-octene) rubber (EOR) blend, its morphological changes with temperature variation were investigated using an atomic force microscopy equipped with a heater accessory. Phase-separated sea-island structures comprising the iPP matrix (sea) and the EOR domains (island) were clearly observed in both specimens. In the injection-molded specimen, the morphology of the EOR domains was fibrous along flow direction (FD). In the iPP matrix, a stripelike structure consisting of alternating iPP crystalline lamellae and amorphous region was clearly observed at room temperature. As increasing temperatures, the iPP amorphous regions seemed to shrink gradually and could not be identified at 80°C. By contrast, in the compression-molded specimen, the EOR domains were circular in shape, and the alternate structure comprising the iPP crystal lamellae and amorphous regions was also found. At elevated temperatures, the iPP amorphous regions gradually enlarged. The analysis of the apparent activation energy obtained by a dynamic mechanical thermal analysis revealed that the differences in the morphological behavior in the iPP matrix region between the both specimens were attributed to the differences in the mobility in the iPP crystal regions.

    Original languageEnglish
    Pages (from-to)1857-1864
    Number of pages8
    JournalJournal of Applied Polymer Science
    Volume108
    Issue number3
    DOIs
    Publication statusPublished - 2008 Mar 5

    Keywords

    • Atomic force microscopy (AFM)
    • Injection molding
    • Polypropylene (PP)

    ASJC Scopus subject areas

    • Chemistry(all)
    • Surfaces, Coatings and Films
    • Polymers and Plastics
    • Materials Chemistry

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