Characterizations of hyperbranched polymer thin films

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

    Research output: Contribution to conferencePaperpeer-review


    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
    Number of pages2
    Publication statusPublished - Dec 1 2006
    Event55th Society of Polymer Science Japan Symposium on Macromolecules - Toyama, Japan
    Duration: Sept 20 2006Sept 22 2006


    Other55th Society of Polymer Science Japan Symposium on Macromolecules

    All Science Journal Classification (ASJC) codes

    • Engineering(all)


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