Abstract
A novel thermotropic liquid crystalline poly(aryl ether ketones) copolymer containing phthalazinone moiety and biphenyl mesogen named P-5050 was developed by a mild solution polycondensation reaction. The thermotropic liquid crystalline properties were characterized by the means of differential scanning calorimetry (DSC), polarized light microscopy (PLM) and wide-angel X-ray diffraction (WAXD). A thread-like texture was achieved when P-5050 was annealed at 320 °C for 1 h, and a typical schlieren texture was observed when shear forces were induced at that temperature. The crystalline-to-liquid crystalline transition (Tm) and the liquid crystalline-to-isotropic phase transition (Ti) appeared in both the first cooling and second heating DSC thermograms. The glass transition temperature (Tg) was 160 °C and the value for 5% weight loss temperature was 510 °C in nitrogen from DSC and TGA determinations, respectively.
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Sun, Q., Wang, J., Jin, K. et al. Synthesis and Thermotropic Liquid Crystalline Behavior of Novel Main-Chain Poly(aryl ether ketones) Copolymer Containing Phthalazinone Moiety and Biphenyl Mesogen. Polym J 40, 46–49 (2008). https://doi.org/10.1295/polymj.PJ2007112
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DOI: https://doi.org/10.1295/polymj.PJ2007112