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Poly(trimethylene terephthalate) 섬유의 고속방사에 따른 미세구조 형성과 물성
조현혹,주시환,鞠谷 雄士 한국섬유공학회 2001 한국섬유공학회지 Vol.38 No.9
PTT polymer was spun by high-speed melt spinning method, and the effects of take-up velocity and mass flow rate on the fiber structure and properties were investigated. The changes in the structure and property with take-up velocities were studied by measuring WAXD, DSC, density, birefringence, dynamic viscoelasticity and tensile test, etc. The orientation in crystalline phase obtained by WASD increased with the increase of take-up velocity. The orientation-induced crystallization of PTT fibers in high-speed melt spinning appeared at the take-up velocity of about 3~4km/min. This tendency was confirmed by the results of DSC thermograms, density, and birefringence. The birefringence increased abruptly up to take-up velocity of 4km/min, but it became almost constant when the take-up velocity exceeded 4km/min. The tendency was confirmed by the result of dynamic viscoelasticity. The maximum point of $\alpha$$_{c}$-dispersion shifted to a higher temperature, but shifted to a lower temperature when the take-up velocity exceeded 4 km/min. The fine structure and the mechanical properties were not affected significantly by mass flow rate.e.
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타이어 코드용 PET 섬유의 연신 조건에 따른 구조와 물성
권지광,황성호,주시환,박진경,조현혹,Kwon, Ji-Kwang,Hwang, Sung-Ho,Ju, Si-Hwan,Park, Jin-Kyung,Cho, Hyun-Hok 한국섬유공학회 2009 한국섬유공학회지 Vol.46 No.6
The effect of drawing ratio and drawing temperature on the structure and physical properties of PET tire cord filaments were investigated using wide-angle X-ray diffraction, density, quantity of meso-phase, tensile test and birefringence. PET tire cord filaments were drawn at 80, 90, and $100^{\circ}C$. WAXD equatorial profile results had shown that the reflection observed at $2\theta=17.4^{\circ}$ and $25.9^{\circ}$ are assigned to the (010) and (100) reflections, and the reflection peak was sharper at higher drawing temperature and ratio. The density increased as drawing temperature and drawing ratio increased. The amount of three phases in the filament; crystalline phase, oriented meso-phase and amorphous, was estimated through the X-ray intensity separation procedure. The amount of meso-phase estimated from X-ray peak using a Lorenzian peak width analysis program. It had been shown that the degree of meso-phase increased as drawing temperature decreased at above glass transition temperature. And the degree of meso-phase increased as drawing ratio increased. It tended to samples were drawn to ratio 7, most degree of meso-phase sample had higher tensile strength than others. The tensile strength and birefringence increased as the degree of meso-phase increased.
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