| 초록 |
The melt blends of thermotropic liquid crystal polymers (TLCPs) and conventional thermoplastics have been one of the extensive scientific and engineering research fields because of their potential application for high performance fibers. TLCPs can act as reinforcements because of their fibrillar and rigid rod-like molecular structure when they are blended with thermoplastic polymers. Initially, TLCPs are dispersed as spheres or droplets in the polymer matrix, and then can be oriented to form fibrils under elongational flow in the melt processing. Consequently, the fine fibrils formed with high aspect ratios can reinforce the polymer matrix effectively. In this research, TLCP reinforced polyester composite fibers (TPCFs) were prepared by melt blending and spinning process to achieve high performance fibers, and fiber property and structure relationship of TPCFs was investigated. The predetermined TLCP:PEN:PET blend compositions were 10:67.5:22.5 in weight ratio. The birefringence and density of TPCFs was increased with spinning speed, which was attributed to the improvement of molecular orientation and chain packing. Mechanical properties of TPCFs were improved by annealing, which suggested that annealing resulted in the formation of more ordered and perfect crystalline structures in TPCFs and the increment of the degree of crystallinity. |
