2011 Fiscal Year Final Research Report
Glass transition of constrained system measured by position sensitive dynamics measurements
| Project/Area Number |
21340121
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Biophysics/Chemical physics
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| Research Institution | Ritsumeikan University |
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Principal Investigator |
FUKAO Koji 立命館大学, 理工学部, 教授 (50189908)
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| Co-Investigator(Kenkyū-buntansha) |
NAKAMURA Kenji 立命館大学, 理工学部, 助教 (00511693)
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| Project Period (FY) |
2009 – 2011
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| Keywords | 高分子薄膜 / ガラス転移 / ダイナミクス測定 |
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| Research Abstract |
The glass transition dynamics of stacked thin films of polystyrene and poly(2-chlorostyrene) were investigated using differential scanning calorimetry and dielectric relaxation spectroscopy. The α-process dynamics of stacked thin films of poly(2-chlorostyrene) show a time evolution from single-thin-film-like dynamics to bulk-like dynamics during the isothermal annealing process. The relaxation rate of the α process becomes smaller with increase in the annealing time. The time scale for the evolution of the α dynamics during the annealing process is very long compared with that for the reptation dynamics. At the same time, the temperature dependence of the relaxation time for the α process changes from Arrhenius-like to Vogel-Fulcher-Tammann dependence with increase of the annealing time. The fragility index increases and the distribution of the α-relaxation times becomes smaller with increase in the annealing time for isothermal annealing. The observed change in the α process is discussed with respect to the interfacial interaction between the thin layers of stacked thin polymer films.
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