| 초록 |
In recent years, melt-blending of thermotropic liquid crystalline polymers (TLCPs) with conventional thermoplastics has attracted great attention because of the improvement in the strength and modulus of polymer composites. TLCPs which existed as ordered domains in liquid crystalline state, exhibited a considerably low melt viscosity and could be oriented to form fibrils under elongational flow in the ordinary melt processing. Melt spinning is the most effective fiber-formation process for the polymer. Present research and development work may yet achieve super-fibers having higher performance and characteristics at lower cost. In this research, the PHB/PEN/PET ternary blends were prepared by melt blending process using twin screw extruder. TLCPs were blended with PEN and PET, and melt spun into fibers in an effort to fiber-performance and processability. TLCPs used were composed of 80mol% p-HBA and 20mol% PET, and blending composition of the ternary blends in weight ratios were 0/50/50, 7.5/46.3/46.3, and 10/45/45. Melt-spun ternary blend fibers were extruded from capillary rheometer at various spinning speeds. The structure and physical properties of PHB/PEN/PET ternary blend fibers were investigated by XRD, DSC, tensile test, and SEM. To investigate the effects of annealing on the properties of PHB/PEN/PET ternary blend fibers, those were annealed at various temperatures and times. The physical properties of the annealed ternary blend fibers could be significantly improved, which were attributed to the development of ordered crystal structures.
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