Synthesis and characterization of liquid crystals and their thermoset films

被引：3
作者：
Ahn, Yong-Ho [1 ]
Jung, Myung-Sup [2 ]
Chang, Jin-Hae [1 ]
机构：
[1] Kumoh Natl Inst Technol, Dept Polymer Sci & Engn, Gumi 730701, South Korea
[2] Samsung Adv Inst Technol, Adv Mat Lab, Yongin 446712, South Korea
来源：
MATERIALS CHEMISTRY AND PHYSICS | 2010年 / 123卷 / 01期
关键词：
Liquid crystal; Liquid crystalline thermoset; Coefficients of thermal expansion; Reactive end group; NUCLEAR-MAGNETIC-RESONANCE; END-CAPPED POLYIMIDES; RIGID ROD MOLECULES; EPOXY-RESINS; THERMAL-EXPANSION; N-PHENYLNADIMIDE; POLYMERIZATION; MONOMERS; BEHAVIOR; COEFFICIENT;
D O I：
10.1016/j.matchemphys.2010.03.079
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
We prepared a series of aromatic liquid crystals (LCs) based on aromatic ester units with the reactive end groups methyl-maleimide and nadimide, and the resulting LCs were thermally cross-linked to produce liquid crystalline thermoset (LCT) films by means of solution-casting and heat treatment. The synthesized LCs and LCTs were characterized with Fourier transform infrared (FT-IR) spectroscopy, H-1 nuclear magnetic resonance (NMR), differential scanning calorimetry (DSC), thermomechanical analysis (TMA), and polarizing optical microscopy with a hot stage. We found that all these LCs form nematic phases. The coefficients of thermal expansion (CTEs) of the LCT films are strongly affected by the reactive end group and the mesogen units in their main-chain structures. The methyl-maleimide-terminated biphenyl LCT was found to have the lowest CTE. (C) 2010 Elsevier BM. All rights reserved.
引用
收藏
页码：177 / 183
页数：7
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