Internal higher-order structure and surface properties of micro-molded disc in micromolding

Hiroshi Ito, Kunihiko Kazama, Takeshi Kikutani, Ken Nakajima, Toshio Nishi

    Research output: Contribution to conferencePaperpeer-review

    Abstract

    Precision micromolding of polypropylene (PP), polyoxymethylene (POM) and polycarbonate (PC) were performed to develop a micro-scale miniature disc and to clarify the mechanism of structure development in micromolded products. Especially effects of process conditions and cavity thickness on surface properties and structure formation in micromolding were evaluated. These structures of molded products were also analyzed by MDSC, birefringence, and SPM measurements. In case of PC micro-disc products, the molecular orientation in the vicinity of the gate was higher than that of any other position. Birefringence also increased with decreasing cavity thickness. Furthermore it was found that the resin flow became unstable in the cavity thickness of 0.1 mm. From observation of cross-section of molded products, skin-shear-core structures were analyzed. The surface elasticity modulus of products in the vicinity of the gate was higher than that of flow end portion.

    Original languageEnglish
    Number of pages1
    Publication statusPublished - 2006 Dec 1
    Event55th Society of Polymer Science Japan Symposium on Macromolecules - Toyama, Japan
    Duration: 2006 Sep 202006 Sep 22

    Other

    Other55th Society of Polymer Science Japan Symposium on Macromolecules
    CountryJapan
    CityToyama
    Period06/9/2006/9/22

    Keywords

    • Elasticity modulus
    • Micro-disc
    • Micromolding
    • Microstructure
    • Optical anisotropy
    • Skin-core structure

    ASJC Scopus subject areas

    • Engineering(all)

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