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Synthesis and characterization of liquid crystalline epoxy resins to study the effect of mesogenic length on the physical properties
Journal of Polymer Research ( IF 2.8 ) Pub Date : 2021-01-06 , DOI: 10.1007/s10965-020-02370-4
Yi-Sheng Lin , Steve Lien-Chung Hsu , Tsung-Han Ho , Li-Cheng Jheng , Yu-Hsiang Hsiao

Two liquid crystalline epoxy (LCE) resins containing different mesogenic lengths were synthesized and cured with two different aromatic diamine curing agents, diaminodiphenylsulfone (DDS) and diaminodiphenylmethane (DDM) to prepare high performance LCE networks. The spectroscopic structures of LCE resins were identified by Fourier transform infrared (FT-IR) spectroscopy, Proton nuclear magnetic resonance (1H-NMR) spectroscopy, mass (MS) spectroscopy, and the formation of nematic and smectic liquid crystalline phase were observed by differential scanning calorimetry (DSC), and polarized optical microscopy (POM). The curing reactions and liquid crystalline textures of the LCE resins were also studied by DSC and POM on the process of curing. The thermal and mechanical properties were investigated for the cured LCE resins with different mesogenic lengths. These results show that the LCE cross-linked networks with long mesogenic group exhibited much higher storage modulus, glass transition temperature, thermal conductivity, thermal stability, and dimensional stability both in the regions of glassy and rubbery states. In addition, both LCE resins have superior thermal and mechanical properties compared to those of the commonly used epoxy resin.



中文翻译:

液晶环氧树脂的合成与表征,研究介晶长度对物理性能的影响

合成了两种具有不同介晶长度的液晶环氧(LCE)树脂,并用两种不同的芳族二胺固化剂二氨基二苯砜(DDS)和二氨基二苯甲烷(DDM)进行固化,以制备高性能LCE网络。LCE树脂的光谱结构通过傅立叶变换红外(FT-IR)光谱,质子核磁共振(1通过差示扫描量热法(DSC)和偏振光学显微镜(POM)观察到1 H-NMR)光谱,质谱(MS)光谱以及向列和近晶液晶相的形成。通过DSC和POM在固化过程中还研究了LCE树脂的固化反应和液晶织构。研究了具有不同介晶长度的固化LCE树脂的热和机械性能。这些结果表明,具有长的介晶基团的LCE交联网络在玻璃态和橡胶态区域均表现出高得多的储能模量,玻璃化转变温度,热导率,热稳定性和尺寸稳定性。另外,与通常使用的环氧树脂相比,两种LCE树脂均具有优异的热性能和机械性能。

更新日期:2021-01-06
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