Abstract
The effects of the rigid units content on tensile properties of thermotropic liquid crystalline (TLC) polyesteramides with bulky side group were investigated by wide-angle X-ray diffraction (WAXD), scanning electron microscopy (SEM), and tensile measurements. The LC phase and relaxation times of TLC polyesteramides were largely dependent on the amount of rigid units. The as-spun fiber of the copolyesteramide (X=0.7) having large amount of rigid units exhibited higher tensile properties than that of the homopolyesteramide (X=1.0). The high tensile strength of copolyesteramide could be explained by the longer relaxation time and better LC property due to the increase of the amount of rigid unit in the molecular chain. The tensile strengths decreased by annealing at 220°C spun fiber, the decrease of tensile strength became dominant in high draw ratio region. It may be attributed to the relaxation of molecular orientation by long time annealing at 220°C.
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Kim, Y. Effect of the Rigid Units Content on Tensile Properties of the Thermotropic Liquid Crystalline Polyesteramides. Polym J 30, 610–615 (1998). https://doi.org/10.1295/polymj.30.610
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DOI: https://doi.org/10.1295/polymj.30.610
