Self-assembled mesoporous silica nanotubes as low-dose reinforcing units for balanced mechanical, thermal and tribological performance of epoxy composites
Dehan Chen , Jinian Yang , Jie Liu , Hengzhi Zhou , Hanxing Yang , Bingyi Li , Changfu Wan , Enhui Chen , Shibin Nie
Epoxy resin (EP) has been widely utilized as a protective coating and structural composite; however, its high brittleness and low wear resistance limit its broader application. In this study, mesoporous silica nanotubes (MSNTs) were synthesized via a facile self-assembly route and incorporated into EP via solution mixing. The as-synthesized MSNTs exhibit a uniform tubular morphology and ordered mesoporous channels, disperse homogeneously within the EP matrix with strong interfacial adhesion, and effectively enhance the mechanical properties at low filler loading. By adding 1% MSNTs, the tensile strength, rupture elongation, elastic modulus, and fracture energy were remarkably improved by 26.1%, 16.8%, 5.3%, and 21.7%, respectively, relative to neat EP, whereas Shore D hardness increased monotonically with increasing filler content. MSNTs barely altered the thermal decomposition but gradually increased the char yield of EP. Dry-sliding tests demonstrated that incorporating 1% MSNTs yields a minimum wear rate of 1.56 × 10−5 mm3∙Nm–1 for EP composites, showing an improvement of 62.4% in wear resistance. Finally, the underlying wear mechanism was systematically elucidated based on careful examination of the worn surfaces. This study provides a high-efficiency reinforcement strategy for polymer composites with low filler mass fractions by rationally designing the one-dimensional silica-based nanofillers.
self-assembly / mesoporous silica nanotubes / epoxy resin / mechanical property / wear mechanism
Higher Education Press 2027
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