Effect of the rubber size on properties of rubber/epoxy composites filled with sub-micron or nano-sized rubber particles
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摘要: 对比研究了由液体橡胶在环氧树脂中原位形成的亚微米橡胶/环氧复合材料和在环氧树脂中直接添加纳米橡胶颗粒形成的纳米橡胶/环氧复合材料的性能。研究表明：未固化混合物的黏度随着纳米橡胶相的加入逐渐增加，但随着亚微米橡胶相含量的增加而降低；橡胶/环氧复合材料的玻璃化转变温度随着纳米橡胶颗粒的加入逐渐增加，但随着亚微米橡胶相含量的增加而降低；两种橡胶相的添加均使复合材料的弹性模量降低，断裂延伸率增加；在较低含量时，纳米橡胶颗粒可以提高环氧的拉伸强度；两种橡胶填充的橡胶/环氧复合材料均显示出明显的增韧效果。微观形貌分析表明，两种橡胶均可以在应力作用下脱粘并促进裂纹尖端的塑性变形。Abstract: A comparative study was carried out on the rubber/epoxy composites filled with sub-micron or nano-sized rubber particles. The results show that the viscosities of uncured epoxy resins increase after adding nano-sized rubber particles, but decrease when mixed with sub-micron ones. The glass transition temperatures of the rubber/epoxy composites increase with the nano-sized rubber particles, but decrease with the sub-micron ones. All rubber particles result in decreasing the elastic modulus of the composites obviously, but increasing the elongations at break. At lower filler content, the nano-sized rubber can improve the tensile strength of epoxy. All rubber particles exhibite significant toughening effect. Based on the morphologies in micro-scale, rubber particle debonding is observed for both rubber particles, and this promotes local plastic deformation around crack tips.
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Keywords:
- rubber /
- epoxy /
- composites /
- fracture toughness /
- mechanical properties
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