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• W2022899148 abstract "Abstract A homologous series of main-chain thermotropic polyesters (PBTn, n = 2, 4, 6) containing biphenyl and triad aromatic ester mesogenic units interconnected by n-methylene spacers in the main chain were prepared from terephthaloyl bis(4-oxybenzoyl chloride) (TOBC) and 4,4′-bis(ω-hydroxyalkyloxy)biphenyls (n-BP, n = 2, 4, 6) by solution polycondensation. The chemical structures of the monomers and PBTn were characterized by spectroscopic techniques and elemental analysis. The solubility, supermolecular structures, thermal and liquid crystalline properties of PBTn were investigated by differential scanning calorimetry (DSC), polarizing microscopy (PLM), small-angle X-ray scattering (SAXS), thermogravimetric analyses (TGA), and wide-angle X-ray diffraction (WAXD), and they were found to be closely dependent on the length of the methylene spacers. The increasing methylene units led to improved solubility, broader liquid crystalline range, reduced mesophase-isotropic transition point, higher thermal stability, and decreasing crystallinity. The decomposition temperatures (5% mass loss) of the polymers were above 380°C in nitrogen atmosphere and only PBT4 and PBT6 exhibited smectic mesophases as well as high viscosity in the mesophase. Keywords: flexible spacersliquid-crystalline polymersmesogenicpolyestersthermal behaviorthermal stability Acknowledgments The financial support from the National Natural Science Foundation of China (No. 50673042) and the Doctoral Discipline Foundation of Ministry of Education of China (No. 20070055015) is gratefully acknowledged. The authors would like to thank Prof. Huiqi Zhang for significant help and Prof. Qiang Wu for instructions of PLM. Notes a+ : Soluble on heating and −: insoluble. aPhase transition temperature and corresponding transition enthalpy in parentheses determined from the DSC of first cooling and second heating at a scanning rate of 10°C/min and PLM. K: Crystal, S: Smectic and I: Isotropic. bΔT h: the temperature range of overall smectic phases on heating and ΔT c: the temperature range of overall smectic phases on cooling. cTemperature of 5% mass loss determined by TGA in nitrogen at a heating rate of 10°C/min." @default.
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• W2022899148 date "2010-12-20" @default.
• W2022899148 modified "2023-10-17" @default.
• W2022899148 title "Preparation of Main-Chain Thermotropic Polyesters With Two Types of Mesogens Connected Alternatively by Aliphatic Spacers" @default.
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• W2022899148 doi "https://doi.org/10.1080/00222341003772241" @default.
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