합성섬유의 미세구조가 물성에 미치는 영향 - 습연신 Polythylene Terephthalate의 구조와 물성 -

The Structure and Mechanical Properties of Wet Drawn PET Filaments

The Crystallinity, orientation, crystallite size, yield stress and initital modulus of wet drawn PET filaments annealed at various temperatures and time intervals were measured by wide angle X-ray diffraction method and, stress strain curves. The following results were found; 1) The crystallinity increases as annealing temperature rises and time increases. In the case of 14$0^{\circ}C$, 16$0^{\circ}C$, and 18$0^{\circ}C$, crystallinity increases up to 50% at 15 minutes of annealing, and there is nosignificant increase between the intervals of 15 and 30 minutes, whereas a remarkable increase(60%) is noted in the case of 22$0^{\circ}C$. 2) The crystallite size of 010 plane and orientation(1/ $\frac{1}{2}$) was observed when annealed at 20$0^{\circ}C$. 3) Initial moduli increase with temperature rises and time increases and change almost linearly with crystallinities and orientations.