Improved mechanical performance and unique toughening mechanisms of UDM processed epoxy-SiO2 nanocomposites,Polymer Composites

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Improved mechanical performance and unique toughening mechanisms of UDM processed epoxy-SiO2 nanocomposites
Polymer Composites ( IF 4.8 ) Pub Date : 2021-08-27 , DOI: 10.1002/pc.26280
Kaushal Kumar ₁ , Manjeet S. Goyat ₂ , Ankur Solanki ₃ , Arun Kumar ₁ , Ravi Kant ₄ , Prakriti K. Ghosh ₅

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This work demonstrates improved mechanical performance and unique toughening mechanisms of ultrasonic dual mixing (UDM) processed epoxy-SiO₂ nanocomposites. The loading of SiO₂ nanoparticles in the epoxy matrix was varied from 1 to 5 vol% to produce the nanocomposites. The mechanical performance was evaluated by measuring the tensile and fracture properties of the nanocomposites. An optimal nanoparticle loading of 3 vol% in epoxy was found vital for improved performance of the nanocomposite. The optimal nanoparticle loading in epoxy lead to an increase of 18.45% in tensile strength and 120% increase in fracture toughness (G_IC) compared to the neat epoxy. The fracture surface analysis revealed various toughening mechanisms including particle pull out, plastic void growth, plastic deformation, and crack deflection along with a unique mechanism of strong interfacial bonding between SiO₂ particle and epoxy matrix.

中文翻译：

UDM 加工的环氧-SiO2 纳米复合材料的改进机械性能和独特的增韧机制

这项工作证明了超声双重混合 (UDM) 处理的环氧树脂-SiO ₂纳米复合材料的机械性能得到改善和独特的增韧机制。环氧树脂基体中SiO ₂纳米颗粒的负载量从1 到5 vol% 不等，以制备纳米复合材料。通过测量纳米复合材料的拉伸和断裂性能来评估机械性能。发现环氧树脂中 3 vol% 的最佳纳米颗粒负载量对于改善纳米复合材料的性能至关重要。环氧树脂中的最佳纳米粒子负载导致拉伸强度增加 18.45% 和断裂韧性增加 120% ( G _IC) 与纯环氧树脂相比。断口分析揭示了各种增韧机制，包括颗粒拉出、塑性空隙增长、塑性变形和裂纹偏转，以及 SiO ₂颗粒和环氧树脂基体之间强界面结合的独特机制。

更新日期：2021-08-27

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