Effect of inorganic material surface chemistry on structures and fracture behaviours of epoxy resin

Tomohiro Miyata, Yohei K. Sato, Yoshiaki Kawagoe (), Keiichi Shirasu (), Hsiao-Fang Wang, Akemi Kumagai, Sora Kinoshita, Masashi Mizukami, Kaname Yoshida, Hsin-Hui Huang, Tomonaga Okabe, Katsumi Hagita, Teruyasu Mizoguchi and Hiroshi Jinnai ()
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Tomohiro Miyata: Tohoku University
Yohei K. Sato: Tohoku University
Yoshiaki Kawagoe: Tohoku University
Keiichi Shirasu: Tohoku University
Hsiao-Fang Wang: National Central University
Akemi Kumagai: Tohoku University
Sora Kinoshita: Tohoku University
Masashi Mizukami: Tohoku University
Kaname Yoshida: Nanostructures Research Laboratory, Japan Fine Ceramics Center
Hsin-Hui Huang: Nanostructures Research Laboratory, Japan Fine Ceramics Center
Tomonaga Okabe: Tohoku University
Katsumi Hagita: National Defense Academy
Teruyasu Mizoguchi: The University of Tokyo
Hiroshi Jinnai: Tohoku University

Nature Communications, 2024, vol. 15, issue 1, 1-12

Abstract: Abstract The mechanisms underlying the influence of the surface chemistry of inorganic materials on polymer structures and fracture behaviours near adhesive interfaces are not fully understood. This study demonstrates the first clear and direct evidence that molecular surface segregation and cross-linking of epoxy resin are driven by intermolecular forces at the inorganic surfaces alone, which can be linked directly to adhesive failure mechanisms. We prepare adhesive interfaces between epoxy resin and silicon substrates with varying surface chemistries (OH and H terminations) with a smoothness below 1 nm, which have different adhesive strengths by ~13 %. The epoxy resins within sub-nanometre distance from the surfaces with different chemistries exhibit distinct amine-to-epoxy ratios, cross-linked network structures, and adhesion energies. The OH- and H-terminated interfaces exhibit cohesive failure and interfacial delamination, respectively. The substrate surface chemistry impacts the cross-linked structures of the epoxy resins within several nanometres of the interfaces and the adsorption structures of molecules at the interfaces, which result in different fracture behaviours and adhesive strengths.

Date: 2024
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DOI: 10.1038/s41467-024-46138-6

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