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

研究成果: ジャーナルへの寄稿記事

28 引用 (Scopus)

抄録

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.

元の言語英語
ページ(範囲)363-367
ページ数5
ジャーナルPhysics Letters, Section A: General, Atomic and Solid State Physics
281
発行部数5-6
DOI
出版物ステータス出版済み - 4 2 2001

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glass transition temperature
polymers
plots
activation energy
protons
glass
thin films

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

これを引用

Effect of chain end group on surface glass transition temperature of thin polymer film. / Jiang, Xiqun; Yang, Chang Zheng; Tanaka, Keiji; Takahara, Atsushi; Kajiyama, Tisato.

:: Physics Letters, Section A: General, Atomic and Solid State Physics, 巻 281, 番号 5-6, 02.04.2001, p. 363-367.

研究成果: ジャーナルへの寄稿記事

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abstract = "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.",
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AU - Yang, Chang Zheng

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AU - Takahara, Atsushi

AU - Kajiyama, Tisato

PY - 2001/4/2

Y1 - 2001/4/2

N2 - 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.

AB - 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.

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