Characterizations of hyperbranched polymer thin films

Keiichi Akabori, Keiji Tanaka, Toshihiko Nagamura, Akihiro Tanaka, Masaaki Ozawa

    Research output: Contribution to conferencePaperpeer-review

    Abstract

    Thermo-mechanical properties in hyperbranched polystyrene (HBPS) films were studied by dynamic mechanical analysis (DMA). The samples for DMA were spin-coated from toluene solutions onto polyimide film (PI) substrates. In case of the proton-terminated HBPS (HBPS-H) film with the thickness of about 400 nm, the αa-absorption peak corresponding to the segmental motion appeared at a temperature lower than that for the corresponding linear PS film due mainly to the large number density of chain ends. As the HBPS-H film became thinner than about 70 nm, the αa-absorption peak became broader than that for the thicker one because of the contribution from the free surface and the substrate interface. Moreover, the αa-relaxation temperature for the HBPS films with dithiocarbamated end groups further decreased, indicating that thermal molecular motion in HBPS films could be controlled by chain end chemistry.

    Original languageEnglish
    Pages3347-3348
    Number of pages2
    Publication statusPublished - Dec 1 2006
    Event55th Society of Polymer Science Japan Symposium on Macromolecules - Toyama, Japan
    Duration: Sep 20 2006Sep 22 2006

    Other

    Other55th Society of Polymer Science Japan Symposium on Macromolecules
    Country/TerritoryJapan
    CityToyama
    Period9/20/069/22/06

    All Science Journal Classification (ASJC) codes

    • Engineering(all)

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