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http://dx.doi.org/10.7317/pk.2012.36.1.009

Synthesis and Characterization of Wholly Aromatic Polyester Liquid Crystalline Thermosets  

Moon, Hyun-Gon (School of Energy and Integrated Materials Engineering, Kumoh National Institute of Technology)
Jung, Myung-Sup (Advanced Materials Lab, Samsung Advanced Institute of Technology)
Chang, Jin-Hae (School of Energy and Integrated Materials Engineering, Kumoh National Institute of Technology)
Publication Information
Polymer(Korea) / v.36, no.1, 2012 , pp. 9-15 More about this Journal
Abstract
We prepared a series of aromatic liquid crystals (LCs) based on wholly aromatic ester units with the reactive end group methyl maleimide by means of melt condensation method, and the resulting LCs were thermally crosslinked to produce liquid crystalline thermoset (LCT) films. The synthesized LCs and LCTs were characterized with Fourier transform infrared (FTIR) spectroscopy, wide angle X-ray diffraction (WAXD), differential scanning calorimetry (DSC), thermogravimetric analysis (TGA), thermomechanical analysis (TMA), and polarizing optical microscopy (POM) with a hot stage. The glass transition temperature ($T_g$) and coefficient of thermal expansion are strongly affected by the mesogen units in their main chain structures. The $p$-substituted biphenyl LC was found to have the highest thermal property value.
Keywords
liquid crystal; liquid crystalline thermoset; thermal property; coefficient of thermal expansion;
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