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Lubricating properties originating from molecular interaction of lubricant components under lubricating condition

Research Project

Project/Area Number 18K13679
Research Category

Grant-in-Aid for Early-Career Scientists

Allocation TypeMulti-year Fund
Review Section Basic Section 18040:Machine elements and tribology-related
Research InstitutionIchinoseki National College of Technology

Principal Investigator

Takiwatari Koji  一関工業高等専門学校, その他部局等, 准教授 (70633353)

Project Period (FY) 2018-04-01 – 2021-03-31
Project Status Completed (Fiscal Year 2020)
Budget Amount *help
¥3,900,000 (Direct Cost: ¥3,000,000、Indirect Cost: ¥900,000)
Fiscal Year 2020: ¥390,000 (Direct Cost: ¥300,000、Indirect Cost: ¥90,000)
Fiscal Year 2019: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2018: ¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000)
Keywordsトライボロジー / 潤滑剤 / 分子間相互作用 / その場観察 / 赤外分光法 / 粘性 / 摩擦 / 潤滑 / 分光分析 / 弾性流体潤滑
Outline of Final Research Achievements

The viscosity and solubility of lubricant components related to lubricating properties are influenced by molecular interaction. In this study, the correlation between molecular interaction and lubricating properties was investigated using in-situ observation with micro-FTIR under EHL condition.
First, polyglycols having several functional groups and non-polar hydrocarbon oils were used as single component system. It was found that the molecular interaction was strengthened by high pressure at EHL contact, and affected the traction coefficient.Concentration of fatty acid as additive decreased at EHL contact, in the case of non-polar hydrocarbon oil was used as base oil. It was suggested that the traction coefficient was related to change in the concentration of the additive due to molecular interaction between additive and base oil.
From the results, the knowledge about the effect of molecular interaction on the lubricating properties was obtained.

Academic Significance and Societal Importance of the Research Achievements

本研究は、潤滑場における分子間相互作用を直接捉えて潤滑膜構造の制御にフィードバックしたことで、分子間相互作用が関わる潤滑現象を解明できたと考える。
得られた成果は、分子間相互作用に関連する潤滑剤の処方や開発、その関連技術の発展に寄与すると期待される。また、分子間相互作用は潤滑状態の接触部における成分濃度や粘性の他に、吸着や相変化にも影響すると予想され応用の範囲が広い。さらに、分子構造や摺動条件を考慮して意図的に分子間相互作用を制御し、接触部で様々な構造をもつ会合体を形成することで、今までにはない新たな潤滑剤の開発が可能となる。

Report

(4 results)
  • 2020 Annual Research Report   Final Research Report ( PDF )
  • 2019 Research-status Report
  • 2018 Research-status Report
  • Research Products

    (3 results)

All 2021 2020 2018

All Journal Article (1 results) (of which Peer Reviewed: 1 results,  Open Access: 1 results) Presentation (1 results) Book (1 results)

  • [Journal Article] Effect of Functional Groups of Polyglycol Oils on Their Lubrication Properties2021

    • Author(s)
      Koji Takiwatari, Shinya Sato, Yasushi Hoshi, Hidetaka Nanao, Shigeyuki Mori
    • Journal Title

      Tribology Online

      Volume: 16 Issue: 1 Pages: 24-30

    • DOI

      10.2474/trol.16.24

    • NAID

      130007992615

    • ISSN
      1881-218X, 1881-2198
    • Year and Date
      2021-02-28
    • Related Report
      2020 Annual Research Report
    • Peer Reviewed / Open Access
  • [Presentation] In situ observation of molecular interaction between polar functional groups in lubricant components during lubrication2018

    • Author(s)
      Koji Takiwatari, Yasushi Hoshi, Hidetaka Nanao
    • Organizer
      4校学術交流会
    • Related Report
      2018 Research-status Report
  • [Book] 高分子材料のトライボロジー制御2020

    • Author(s)
      中谷達行、山口健、小長谷重次、桃園聡、滝渡幸治他
    • Total Pages
      550
    • Publisher
      情報技術協会
    • ISBN
      9784861047770
    • Related Report
      2019 Research-status Report

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Published: 2018-04-23   Modified: 2022-01-27  

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