| 초록 |
Thermotropic liquid crystalline polyesters (TLCPs) are high performance engineering plastics used in various applications due to their excellent properties in terms of thermal resistance, mechanical strength, and chemical resistance. One of the best known commercially available TLCPs, Vectra, is a copolyester synthesized from 4-hydroxy benzoic acid (HBA) and 2-hydroxy-6-naphthoic acid (HNA). In this study, to improve the anisotropic mechanical properties and facile fibrilization of Vectra, a series of TLCPs were synthesized by introducing relatively flexible cycloaliphatic units. For this purpose, TLCPs were synthesized by melt-polycondensation of HBA, HNA, terephthalic acid (TPA), isophthalic acid (IPA), and 1,4-cyclohexylene dimethanol (CHDM) monomers. The chemical and microstructural features of the synthesized TLCPs were characterized with aids of FT-IR, XRD, SEM, and POM. The thermal transition, thermal stability, and mechanical properties were analyzed using DSC, TGA, and DMA. |
