The microscopic mechanism of size effect in silica-particle reinforced silicone rubber composites

材料科学 复合材料 极限抗拉强度 复合数 弹性体 硅橡胶 韧性 粒子(生态学) 天然橡胶 粒径 硅酮 纳米颗粒 断裂韧性 纳米 纳米技术 化学 物理化学 地质学 海洋学
作者
Jinhan Chen,Jian Liu,Zhilong Peng,Yin Yao,Shaohua Chen
出处
期刊:Engineering Fracture Mechanics [Elsevier BV]
卷期号:255: 107945-107945 被引量:12
标识
DOI:10.1016/j.engfracmech.2021.107945
摘要

Particle reinforced elastomer matrix composites always show a size-dependently mechanical behavior when the particle size shrinks down to micro- or even nano-scale. A systematic investigation on microscopic mechanisms of such a size effect is carried out in this paper based on tensile and tear experiments of silicone rubber elastomer filled with surface modified silica particles, in which the particle size ranges from tens of to several hundreds of nanometers. It is found that, when the particle content is fixed, the ultimate strength, fracture toughness and fracture tensile strain of the composite exhibit monotonic increase with the decrease of particle size. In the composite filled with monodispersed submicro-particles, the improved strength is due to the hindering effect of particles on the crack propagation and the strong interface bonding between particles and matrix, while the improved toughness is mainly resulted from the crack-pinning around particles. In the composite filled with nano-sized particles, both the filler-hindering effect and the strong interface still contribute to the strength of the composite, while not only the crack pinning but also the interface debonding around nanoparticle aggregates will toughen the composite. Furthermore, a hierarchical network structure consisting of differently-sized aggregates and bounded rubbers endows the composite with a better load bearing capacity than the one filled with separately distributed fillers. As a result, the composite filled with small nano-nanoparticles shows remarkably improved mechanical properties in comparison with the composite filled with submicro-particles. The present work should provide insights for optimally designing a flexible composite with both desirable strength and toughness.
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