Time and space-resolved fluorescence study on interfacial glass transition temperature of polymer and its responsible factors

Yu Tsuchmura, Keiji Tanaka, Toshihiko Nagamura

    Research output: Contribution to conferencePaperpeer-review

    Abstract

    Lifetime for fluorescent probe, 6-(N-(7-nitrobenz- 2-oxa-1,3-diazol-4-yl) amino)hexanoic acid (NBD), mixed into polystyrene (PS) in a film on sapphire and S-LAH79 substrates was examined as a function of temperature. Picosecond pulse with the wavelength of 430 nm was irradiated into the film from the substrate side. Information near the substrate interface was successfully extracted on the basis of evanescent wave excitation. The lifetime for NBD monotonically decreased with increasing temperature because the fractional amount of non-radiative pathways to the ground state for excited species increased with temperature. In general, as measuring temperature goes beyond a temperature at which molecular motion releases, the slope for the temperature-lifetime relationship changes. Under the condition employed, the inflection point could be assigned to glass transition temperature (Tg). The value obtained at the interface was higher than the corresponding bulk value, and this inclination was remarkable closer to the interface. Thus, it was concluded that chain mobility in the interfacial region was restricted in comparison with that in the bulk phase, and chains closer to the substrate possess less mobility.

    Original languageEnglish
    Pages4292-4293
    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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