超高速紡糸によるナイロン66繊維の物性と構造

抄録

Structure and properties of ultra-high speed spun nylon 66 [poly (hexamethylene adipamide)] fibers prepared at take-up speeds of 5 to 12km/min were investigated through the X-ray and thermal analyses and the measurements of mechanical properties. With an increase in the take-up speed, both Young's modulus and dynamic storage modulus increased monotonously, while tenacity reached a maximum at around 6km/min. Birefringence and amorphous orientation function also showed a maximum. In contrast with these results, density showed a tendency of saturation at high-speed region. The existence of void in the filament was also suggested by the smallangle X-ray scattering measurement. From the wide-angle X-ray diffraction analysis, the increase in the crystalline orientation function, crystal perfection index and the thickness of lamellar were observed with an increase in the take-up speed. Thus, it was concluded that highly ordered crystalline structure was formed in the high-speed spinning of nylon 66 fibers. The existence of peak in tenacity was related with the formation of the void in the filament and the increase of Young's modulus was related with the ordering of crystalline structure.