Interfacial mobility of polymers on inorganic solids

Keiji Tanaka, Yohei Tateishi, Yohei Okada, Toshihiko Nagamura, Masao Doi, Hiroshi Morita

Research output: Contribution to journalArticle

80 Citations (Scopus)

Abstract

The segmental mobility of a typical amorphous polymer, polystyrene, at the interfaces with solid substrates was noninvasively examined by fluorescence lifetime measurements using evanescent wave excitation in conjunction with coarse-grained molecular dynamics simulation. The glass transition temperature (Tg) was discernibly higher at the interface than in the internal bulk region. Measurements at different incident angles of excitation pulses revealed that Tg became higher closer to the interface. The gradient became more marked with an increasing difference in the free energy at the interface between the polymer and solid substrate. The Tg value at the interface decreased with decreasing molecular weight. However, the decrement for the interfacial Tg was not as much as that for the bulk Tg, due to the restriction of chain end portions by the substrate. Finally, it was observed that when a film became thinner than 50 nm, the depressed mobility at the interface coupled with the enhanced mobility induced by the presence of the surface. The experimental and simulation results were in good accord with each other.

Original languageEnglish
Pages (from-to)4571-4577
Number of pages7
JournalJournal of Physical Chemistry B
Volume113
Issue number14
DOIs
Publication statusPublished - Apr 9 2009

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Polymers
Transition Temperature
Polystyrenes
polymers
Substrates
Molecular Dynamics Simulation
Glass
Molecular Weight
Fluorescence
Free energy
Molecular dynamics
Molecular weight
Thin films
evanescent waves
wave excitation
Computer simulation
glass transition temperature
molecular weight
constrictions
polystyrene

All Science Journal Classification (ASJC) codes

  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films
  • Materials Chemistry

Cite this

Tanaka, K., Tateishi, Y., Okada, Y., Nagamura, T., Doi, M., & Morita, H. (2009). Interfacial mobility of polymers on inorganic solids. Journal of Physical Chemistry B, 113(14), 4571-4577. https://doi.org/10.1021/jp810370f

Interfacial mobility of polymers on inorganic solids. / Tanaka, Keiji; Tateishi, Yohei; Okada, Yohei; Nagamura, Toshihiko; Doi, Masao; Morita, Hiroshi.

In: Journal of Physical Chemistry B, Vol. 113, No. 14, 09.04.2009, p. 4571-4577.

Research output: Contribution to journalArticle

Tanaka, K, Tateishi, Y, Okada, Y, Nagamura, T, Doi, M & Morita, H 2009, 'Interfacial mobility of polymers on inorganic solids', Journal of Physical Chemistry B, vol. 113, no. 14, pp. 4571-4577. https://doi.org/10.1021/jp810370f
Tanaka K, Tateishi Y, Okada Y, Nagamura T, Doi M, Morita H. Interfacial mobility of polymers on inorganic solids. Journal of Physical Chemistry B. 2009 Apr 9;113(14):4571-4577. https://doi.org/10.1021/jp810370f
Tanaka, Keiji ; Tateishi, Yohei ; Okada, Yohei ; Nagamura, Toshihiko ; Doi, Masao ; Morita, Hiroshi. / Interfacial mobility of polymers on inorganic solids. In: Journal of Physical Chemistry B. 2009 ; Vol. 113, No. 14. pp. 4571-4577.
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