| 학회 | 한국고분자학회 |
| 학술대회 | 2002년 봄 (04/12 ~ 04/13, 서울대학교) |
| 권호 | 27권 1호, p.29 |
| 발표분야 | 고분자 가공/블렌드 |
| 제목 | Thermotropic Liquid Crystal Polymer Reinforced Polyesters |
| 초록 | Poly(p-hydroxy benzoate) (PHB)-poly(ethylene terephthalate) (PET) 8-2 thermotropic liquid crystalline copolyester, poly(ethylene 2,6-naphthalate) (PEN), and PET were mechanically blended to obtain liquid crystalline phase of ternary blend. Mechanical blend is a cost effective, time saving, and productive way to achieve polymer property improvement. Mechanical properties of the ternary blend fiber were investigated with composition ratio, filament winding speed, and thermal treatment. The ternary blend LCP fibers have great potential to use in industrial high strength fibers. The PET and PEN portion may provide improved melt spinablity, and the PHB portion can improve mechanical property of the fibers. The ternary blends were processed as films and filament with/without catalyst DBTDL and their matrix components were dissolved in o-chlorophenol at 55℃ for 1 hr to investigate the co-continuous phase. When DBTDL was added droplets of liquid crystalline polymer became smaller and more uniform, which was attributed to enhanced miscibility between LCP and matrix polymer. In the crystallization behavior, Avrami exponent n was approximately 3.02~3.42 when the blends were crystallized non-isothermally and 2.93~3.24 when crystallized isothermally to show three-dimensional spherical shape. Shape of spherulites of binary blends in polarized optical micrographs was similar to Maltese cross, which was in line with theoretical concept. In Advanced Rheological Expansion System (ARES) test, complex viscosity of the blends containing over 40 mol% of PHB decreased abruptly at 290℃~310℃ and the morphology was close to homo phase as shown in log G’ versus log G’’ graph. Droplets of LCP and pores caused by dissolving of matrix components in the blends with 30wt% of PHB and more could be controlled by the conditions such as wt% of LCP, catalyst, and heat treatment etc. Also, crystallization rate and morphology of matrix components were dependent on processing temperature. Therefore, PHB/PEN/PET ternary blends showed pseudo LC phase and liquid crystalline component became co-continuous phase. The ternary blended LCP fiber can be a great candidate of cheap as well as high performance fibers for industrial use with easy of processin. |
| 저자 | 김성훈 |
| 소속 | 한양대 |
| 키워드 | |
