Material design of rubber composite filled with particles by controlling interphase layer formed on nanoparticle surface

2022 Fiscal Year Final Research Report

• Project/Area Number: 20K04159
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Review Section: Basic Section 18010:Mechanics of materials and materials-related
• Research Institution: Toyohashi University of Technology
• Principal Investigator: Adachi Tadaharu 豊橋技術科学大学, 工学(系)研究科(研究院), 教授 (20184187)
• Co-Investigator(Kenkyū-buntansha): 石井 陽介 京都大学, 工学研究科, 助教 (70781706)
• Project Period (FY): 2020-04-01 – 2023-03-31
• Keywords: 複合材料 / シリコーンゴム / シリカ粒子 / 中間層 / 力学的特性 / ナノ粒子 / 架橋密度

Outline of Final Research Achievements

The mechanical properties of silicone rubber composites filled with the silica particles were experimentally and theoretically investigated to clarify the effects of the crosslinking density of the matrix rubber and the interphase layers formed around the nanoparticles. The stiffness, strength, and toughness of the rubber composites were found to depend on the particle volume fraction, which apparently increased by the interphase layers. The fracture toughness of the nanoparticle-filled composites was clarified to be higher than that of the micro-particle-filled composites for some crosslinking densities. Therefore, the mechanical properties: the stiffness, strength, and toughness of rubber composites could be controlled by the particle size, particle volume fraction, and crosslinking density of the matrix rubber.and crosslinking density of the matrix rubber.

Free Research Field

材料力学，材料工学

Academic Significance and Societal Importance of the Research Achievements

ナノ粒子を充填することで粒子表面に形成される中間層により見かけ上，粒子充填率が増加し，低充填率でも高い剛性，靭性を得ることが可能であることを示した．その中でも母材ゴムの特定の架橋密度では粒径の大きい粒子を充填した場合よりもさらに高い破壊靭性を得ることができることが示した．以上のことから，粒子充填ゴム複合材料について，充填粒子の粒径・体積充填率および母材の架橋密度を変えることにより剛性，強度，靭性の力学的特性を材料設計することが可能であることを明らかにした．