Effect of water swelling on the tribological properties of pmma spin-cast film and brush in aqueous environment

Myo Minn, Motoyasu Kobayashi, Hiroshi Jinnai, Hirohmi Watanabe, Atsushi Takahara

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)


Due to their light weight, low corrosion and good tribological properties, polymer films have been widely studied in dry condition as well as recently in aqueous environment. Though the presence of water can further reduce the friction, it promotes the wear rate of the polymer films. As a remedy to decrease the wear rate of polymer films under aqueous condition, in this study, we used PMMA brush which is chemically anchored to a substrate and compared its friction and wear properties with those of conventional PMMA spin-cast film. Ellipsometry, contact angle measurements and atomic force microscopy are used to study the surface properties, e.g., wear mechanisms and wear depths of PMMA films. Under different sliding speeds and applied loads, PMMA brush showed lower friction than PMMA spin-cast film in aqueous. Moreover, it was shown that the swelling of water molecules is a dominant factor in determining the wear durability of PMMA films in which PMMA brush showed better wear performance than PMMA spin-cast film.

Original languageEnglish
Pages (from-to)121-129
Number of pages9
JournalTribology Letters
Issue number1
Publication statusPublished - 2014 Jul
Externally publishedYes


  • Aqueous
  • Friction
  • Swelling and wear

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films


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