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Biphenyl liquid crystal epoxy containing flexible chain: Synthesis and thermal properties
Journal of Applied Polymer Science ( IF 2.7 ) Pub Date : 2020-02-28 , DOI: 10.1002/app.49143 Qian Zhang 1, 2, 3, 4 , Guokang Chen 1, 4 , Kun Wu 1, 2, 3 , Jun Shi 1, 2, 3 , Liyan Liang 1, 2, 3 , Mangeng Lu 1, 2, 3
Journal of Applied Polymer Science ( IF 2.7 ) Pub Date : 2020-02-28 , DOI: 10.1002/app.49143 Qian Zhang 1, 2, 3, 4 , Guokang Chen 1, 4 , Kun Wu 1, 2, 3 , Jun Shi 1, 2, 3 , Liyan Liang 1, 2, 3 , Mangeng Lu 1, 2, 3
Affiliation
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A biphenyl type liquid crystal epoxy (LCE) monomer 4,4′‐di(2,3‐epoxyhexyloxy)biphenyl (LCBP4) containing flexible chain was synthesized and the curing behavior was investigated using 4,4′‐diaminodiphenylmethane (DDM) as the curing agent. The effect of curing condition on the formation of the liquid crystalline phase was examined. The cured samples show good mechanical properties and thermal stabilities. Moreover, the relationship between thermal conductivity and structure of liquid crystalline domain was also discussed. The samples show high thermal conductivity up to 0.28–0.31 W/(m*K), which is 1.5 times as high as that of conventional epoxy systems. In addition, thermal conductive filler, Al2O3, was introduced into LCBP4/DDM to obtain higher thermal conductive composites. When the content of Al2O3 was 80 wt%, the thermal conductivity of the composite reached to 1.86 W/(m*K), while that of diglycidyl ether of bisphenol A (Bis‐A) epoxy resin/DDM/Al2O3 was 1.15 W/(m*K). Compared with Bis‐A epoxy resin, the formation of liquid crystal domains in the cured LCE resin enhanced the thermal conductivity synergistically with the presence of Al2O3. Furthermore, the introduction of Al2O3 also slightly increased the thermal stabilities of the cured LCE.
中文翻译：
含柔性链的联苯液晶环氧树脂：合成与热性能
合成了具有柔性链的联苯型液晶环氧（LCE）单体4,4'-二（2,3-环氧己氧基）联苯（LCBP4），并以4,4'-二氨基二苯甲烷（DDM）作为固化剂，研究了其固化行为。固化剂。研究了固化条件对液晶相形成的影响。固化的样品显示出良好的机械性能和热稳定性。此外，还讨论了热导率与液晶畴结构之间的关系。样品显示出高达0.28–0.31 W /（m * K）的高导热率，是传统环氧体系的1.5倍。另外，导热填料Al 2 O 3将其引入LCBP4 / DDM中以获得更高的导热复合材料。当Al 2 O 3的含量为80 wt％时，复合材料的导热系数达到1.86 W /（m * K），而双酚A（Bis‐A）环氧树脂/ DDM / Al 2的二缩水甘油醚的导热系数达到O 3为1.15 W /（m * K）。与Bis-A环氧树脂相比，在固化的LCE树脂中液晶域的形成与Al 2 O 3的存在协同地提高了导热性。此外，Al 2 O 3的引入也略微提高了固化的LCE的热稳定性。
更新日期：2020-02-28
中文翻译：
含柔性链的联苯液晶环氧树脂：合成与热性能
合成了具有柔性链的联苯型液晶环氧（LCE）单体4,4'-二（2,3-环氧己氧基）联苯（LCBP4），并以4,4'-二氨基二苯甲烷（DDM）作为固化剂，研究了其固化行为。固化剂。研究了固化条件对液晶相形成的影响。固化的样品显示出良好的机械性能和热稳定性。此外，还讨论了热导率与液晶畴结构之间的关系。样品显示出高达0.28–0.31 W /（m * K）的高导热率，是传统环氧体系的1.5倍。另外，导热填料Al 2 O 3将其引入LCBP4 / DDM中以获得更高的导热复合材料。当Al 2 O 3的含量为80 wt％时，复合材料的导热系数达到1.86 W /（m * K），而双酚A（Bis‐A）环氧树脂/ DDM / Al 2的二缩水甘油醚的导热系数达到O 3为1.15 W /（m * K）。与Bis-A环氧树脂相比，在固化的LCE树脂中液晶域的形成与Al 2 O 3的存在协同地提高了导热性。此外，Al 2 O 3的引入也略微提高了固化的LCE的热稳定性。
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