Mechanism elucidation and control of efficient release of healing agent in self-healing coatings containing nanofibers

2022 Fiscal Year Final Research Report

• Project/Area Number: 20H02485
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Single-year Grants
• Section: 一般
• Review Section: Basic Section 26050:Material processing and microstructure control-related
• Research Institution: Hiroshima University
• Principal Investigator: Yabuki Akihiro 広島大学, 先進理工系科学研究科(工), 教授 (70284164)
• Co-Investigator(Kenkyū-buntansha): 吉岡 朋久 神戸大学, 先端膜工学研究センター, 教授 (50284162) ; 李 志河 広島大学, 先進理工系科学研究科(工), 助教 (90809584)
• Project Period (FY): 2020-04-01 – 2023-03-31
• Keywords: 自己修復 / ナノファイバー / コーティング / 腐食 / 放出 / 防食 / 金属

Outline of Final Research Achievements

(1) Water absorption was high for the polymer that preheated after mixing with nanofiber and organic healing agent. (2) The release rate of the inorganic healing agent from the polymer was higher than that of the organic healing agent. (3) The release of the healing agent from the polymer added carboxylic acid was higher. (4) Molecular dynamics simulations showed that the diffusion of the healing agent adsorbed on the nanofiber surface was slower and faster in the center of the nano space. (5) Inorganic healing agent showed higher diffusion coefficients than organic healing agent. (6) Self-healing coatings with carboxylic acid added to nanofibers and healing agent showed long-term self-healing properties. (7) Coatings with a two-layer extrusion structure consisting of a layer of inorganic healing agent, and a layer of organic healing agent and nanofibers showed high self-healing properties.

Free Research Field

工学

Academic Significance and Societal Importance of the Research Achievements

ナノファイバーを経路とするポリマー中での物質移動と放出の現象は自己修復以外の他分野を含めて新しい。本研究で用いるセルロースナノファイバーは医療分野にも適用可能であり，DDS（ドラッグデリバリーシステム）にも展開でき，その過程を実験、数理計算の両面から理解することは学術的にも技術的にも意義がある。