Effect of chain end group on surface glass transition temperature of thin polymer film

Xiqun Jiang, Chang Zheng Yang, Keiji Tanaka, Atsushi Takahara, Tisato Kajiyama

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31 Citations (Scopus)


Surface glass transition behaviors of proton end capped poly(2-vinylpyridine) (P2VP-H) and perfluoroalkyl end capped poly(2-vinylpyridine) (P2VP-C2C8F) thin films were investigated based on temperature-dependent lateral force microscopic (TDLFM) measurement. It is found that the species of chain end groups have significant influence on the surface glass transition temperature of the thin polymer film. For both samples, it is revealed that the surface glass transition temperatures decrease significantly in comparison to the bulk ones, and the magnitude order of reduction in surface Tg for P2VP-C2C8F is larger than that for P2VP-H. The apparent activation energy of surface α-relaxation calculated from the Arrhenius plot is ca. 292 ± 40 and 212 ± 40 kJ/mol for P2VP-H and P2VP-C2C8F, respectively, and is much smaller than the bulk one. The depression of the surface Tg for thin polymer films is explained by the excess free volume induced by the enrichment of chain end groups at the surface.

Original languageEnglish
Pages (from-to)363-367
Number of pages5
JournalPhysics Letters, Section A: General, Atomic and Solid State Physics
Issue number5-6
Publication statusPublished - Apr 2 2001

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)


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