Synthesis and Characterization of Liquid-Crystalline Epoxy and its Blend with Conventional Epoxy
Synthesis and Characterization of Liquid-Crystalline Epoxy and its Blend with Conventional Epoxy
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DOI：
10.1002/pola.10923
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发表时间：
2003-11
期刊：
影响因子：
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通讯作者：
K. Sadagopan;D. Ratna;A. Samui
中科院分区：
文献类型：
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作者：
K. Sadagopan;D. Ratna;A. Samui
对苯二甲酰氯与对羟基苯甲酸反应得到对苯二甲酰双（4-羟基苯甲酸）酸，对其进行了表征，并与环氧树脂[双酚A二缩水甘油醚（DGEBA）]反应得到液晶环氧树脂（LCEP）。通过傅里叶变换红外光谱、1H和13 C NMR光谱、差示扫描量热法（DSC）和偏光显微镜（POM）对该LCEP进行了表征。然后将LCEP以各种组合物与DGEBA共混，并用室温固化硬化剂固化。采用DSC和动态力学分析（DMA）对共混物的热性能和粘弹性能进行了表征。与纯DGEBA网络相比，固化共混物表现出更高的储能模量和更低的玻璃化转变温度（tan δmax，来自DMA）。POM观察到LCEP和DGEBA/LCEP共混物固化过程中近晶液晶相的形成。© 2003 Wiley Periodicals，Inc.聚合物科学杂志A部分：聚合物化学41：3375-3383，2003
Terephthaloyl chloride was reacted with 4-hydroxy benzoic acid to get terephthaloylbis(4-oxybenzoic) acid, which was characterized and further reacted with epoxy resin [diglycidyl ether of bisphenol A (DGEBA)] to get a liquid-crystalline epoxy resin (LCEP). This LCEP was characterized by Fourier transform infrared spectrometry, 1H and 13C NMR spectroscopy, differential scanning calorimetry (DSC), and polarized optical microscopy (POM). LCEP was then blended in various compositions with DGEBA and cured with a room temperature curing hardener. The cured blends were characterized by DSC and dynamic mechanical analysis (DMA) for their thermal and viscoelastic properties. The cured blends exhibited higher storage moduli and lower glass-transition temperatures (tan δmax, from DMA) as compared with that of the pure DGEBA network. The formation of a smectic liquid-crystalline phase was observed by POM during the curing of LCEP and DGEBA/LCEP blends. © 2003 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 41: 3375–3383, 2003