Epoxy resin is widely used due to its electrical insulation performances, but low elongation defects at the break, low thermal conductivity, and high brittleness limit its application scenarios. In this paper, the mesogen is utilized to improve the thermal conductivity and mechanical toughness of the traditional epoxy resin. Both the mechanical performances, including the impact strength, tensile strength, the bending strength, and the thermal behaviors, including the thermal conductivity, are investigated. Results show that with the biphenyl liquid crystal epoxy resin(BLCER) content of 10%, the impacting strength, tensile strength, and bending strength are increased by 71%, 21%, and 11%, respectively. The thermal conductivity of the composites increases to 2.26 times that of pure epoxy resin. Both the enhanced mechanical and thermal performance of the epoxy resin by the mesogen incorporation are further investigated. It is indicated that the mesogen in the Biphenyl Liquid Crystal Epoxy Resin significantly improve both the mechanical toughness and thermal conductivity of the epoxy resin by the formation of the micro-crack behavior and the thermal conductive networks, respectively. With the aids of the mesogen, the improved variety of properties in epoxy resin without reducing its original performance is attractive in the industry application with great demand in the balance of the comprehensive performances.

中文翻译：

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通过掺入不含纳米填料的介晶提高环氧树脂的导热性和机械韧性

环氧树脂由于其电绝缘性能而被广泛使用，但是断裂时的低伸长率缺陷，低导热率和高脆性限制了其应用场景。在本文中，液晶元被用来提高传统环氧树脂的导热性和机械韧性。研究了两种机械性能，包括冲击强度，抗张强度，弯曲强度以及包括热导率在内的热行为。结果表明，在联苯液晶环氧树脂（BLCER）含量为10％的情况下，冲击强度，拉伸强度和弯曲强度分别提高了71％，21％和11％。复合材料的热导率增加到纯环氧树脂的2.26倍。进一步研究了通过介晶结合提高环氧树脂的机械性能和热性能。结果表明，联苯液晶环氧树脂中的液晶元通过形成微裂纹行为和导热网络显着提高了环氧树脂的机械韧性和导热性。借助于液晶元，在不降低其原始性能的情况下改善环氧树脂的各种性能在工业应用中具有吸引力，对综合性能的平衡提出了很高的要求。结果表明，联苯液晶环氧树脂中的液晶元通过形成微裂纹行为和导热网络显着提高了环氧树脂的机械韧性和导热性。借助于液晶元，在不降低其原始性能的情况下改善环氧树脂的各种性能在工业应用中具有吸引力，对综合性能的平衡提出了很高的要求。结果表明，联苯液晶环氧树脂中的液晶元通过形成微裂纹行为和导热网络显着提高了环氧树脂的机械韧性和导热性。借助于液晶元，在不降低其原始性能的情况下改善环氧树脂的各种性能在工业应用中具有吸引力，对综合性能的平衡提出了很高的要求。