Synthesis-Structure-Property Relationship of Thermotropic Liquid Crystalline Polyesters with Cycloaliphatic and Amide Groups
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초록
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Thermotropic liquid crystalline polyesters (TLCPs) are known for their rigid aromatic structure, which imparts excellent thermal stability, mechanical properties. To synthesize TLCP with improved intermolecular interactions and sufficiently processable melting point, A one-pot melt polymerization method was employed using 4-hydroxybenzoic acid (HBA), 6-hydroxy-2-naphthoic acid (HNA), terephthalic acid (TPA), and 4,4'-Methylenebis(cyclohexylamine) as monomers. The liquid crystalline, fibrillar, and molecular structures of TLCPs were characterized using polarized optical microscopy, scanning electron microscopy, and Fourier-transform infrared spectroscopy. Differential scanning calorimetry was utilized to study the thermal transitions, thermogravimetric analysis for thermal stability evaluation, dynamic mechanical analysis to assess mechanical properties, and rotational rheometry for analyzing rheological behavior. Additionally, the dielectric properties of the TLCPs were investigated.