Drawing tests upon PET POY have been made by using dynamic thermal stress analyser,which show that the dynamic thermal stress of fiber is readily affected by drawing conditions. Aseries of samples have been obtained u...Drawing tests upon PET POY have been made by using dynamic thermal stress analyser,which show that the dynamic thermal stress of fiber is readily affected by drawing conditions. Aseries of samples have been obtained under different drawing velocities, drawing temperatures anddraw ratios. The variations of structural factors of fiber such as the orientation, crystallinity,crystallite size and the thermal shrinkage have been measured. It is proved through experimentsthat the thermal shrinkage（Y） of the drawn fiber of PET POY is influenced by the orientation （rep-resented by sonic velocity x<sub>1</sub>） and crystallinity （x<sub>2</sub>） of the fiber. The quantitative relationship is es-tablished using the binary regression method: Y=10.2246+2.2030x<sub>1</sub>-26.2670x<sub>2</sub> The mechanical properties such as tenacity, elongation, yield stress, initial modulus and the te-nacity at 10% elongation, etc. have also been measured. The relations between the tenacity at 10%elongation （D） and drawing velocity（V）, draw ratio （DR）, drawing temperature （T）, and sonic ve-locity and crystallinity have been obtained using a method of mathematical statistics: D=4.594-0.009 6V , D=-8.937+7.170DR, D=2.866+0.00629T, D=-7.34+2.866x<sub>1</sub>+6.314x<sub>2</sub> These equations fit well with data from the experiments. This work will be benefical to the control of quality of products and the development of newproducts.展开更多
文摘Drawing tests upon PET POY have been made by using dynamic thermal stress analyser,which show that the dynamic thermal stress of fiber is readily affected by drawing conditions. Aseries of samples have been obtained under different drawing velocities, drawing temperatures anddraw ratios. The variations of structural factors of fiber such as the orientation, crystallinity,crystallite size and the thermal shrinkage have been measured. It is proved through experimentsthat the thermal shrinkage（Y） of the drawn fiber of PET POY is influenced by the orientation （rep-resented by sonic velocity x<sub>1</sub>） and crystallinity （x<sub>2</sub>） of the fiber. The quantitative relationship is es-tablished using the binary regression method: Y=10.2246+2.2030x<sub>1</sub>-26.2670x<sub>2</sub> The mechanical properties such as tenacity, elongation, yield stress, initial modulus and the te-nacity at 10% elongation, etc. have also been measured. The relations between the tenacity at 10%elongation （D） and drawing velocity（V）, draw ratio （DR）, drawing temperature （T）, and sonic ve-locity and crystallinity have been obtained using a method of mathematical statistics: D=4.594-0.009 6V , D=-8.937+7.170DR, D=2.866+0.00629T, D=-7.34+2.866x<sub>1</sub>+6.314x<sub>2</sub> These equations fit well with data from the experiments. This work will be benefical to the control of quality of products and the development of newproducts.
