Effect of the Control of Polymer Flow in the Vicinity of Spinning Nozzle on Mechanical Properties of Poly(ethylene terephthalate) Fibers
Effect of the Control of Polymer Flow in the Vicinity of Spinning Nozzle on Mechanical Properties of Poly(ethylene terephthalate) Fibers
复制标题
纺丝喷嘴附近聚合物流动控制对聚对苯二甲酸乙二醇酯纤维力学性能的影响
DOI：
10.3139/217.2330
复制
发表时间：
2010
影响因子：
1.3
通讯作者：
T. Kikutani
中科院分区：
文献类型：
--
作者：
M. Masuda;W. Takarada;T. Kikutani
摘要研究了PET熔体纺丝过程中，喷丝头附近流动行为的变化对初生纤维和拉伸纤维力学性能的影响。通过改变喷丝头直径和在喷丝头正下方的喷丝线上照射CO_2激光，改变了喷丝头的流动行为。通过应用小直径喷嘴和激光照射，表示初生纤维的强度与断裂伸长率之间的相关性的曲线向右上方移动，表明初生纤维的韧性得到改善。不同拉伸比的初生纤维的两阶段连续拉伸表明，拉伸纤维的强度和伸长率之间的相关性也向右上方向移动，通过应用小直径喷嘴和激光照射。换句话说，在拉伸纤维中保留了初纺纤维中改进的韧性。因此，通过对通过小直径喷嘴和激光照射的组合制备的初生纤维进行拉伸，获得了拉伸强度为1.68GPa（12.1cN/dtex）、断裂伸长率为9.1%的高强度和高韧性PET纤维。数值模拟结果表明，采用小直径喷嘴和激光辐射加热可降低纺丝线上的最大Deborah数。由此推测，熔体纺丝过程中聚合物流动的差异引起的分子缠结状态的变化对所得纤维的力学性能有显著影响。
Abstract In the melt spinning of PET, effects of the variation of flow behavior in the vicinity of spinning nozzle on the mechanical properties of as-spun fibers and drawn fibers were investigated. The variation of flow behavior was introduced by the change of spinning nozzle diameter and by the irradiation of CO2 laser to the spin-line at a position immediately below the spinneret. The curve representing the correlation between strength and elongation at break of as-spun fibers shifted toward the upper-right direction by the applications of small diameter nozzle and laser irradiation, indicating that the toughness of as-spun fibers was improved. The two-stage continuous drawing of as-spun fibers with various draw ratios revealed that the correlation between strength and elongation of drawn fibers also shifted toward the upper-right direction by the application of small diameter nozzle and laser irradiation. In other words, improved toughness in the as-spun fibers was preserved in the drawn fibers. Accordingly, by the drawing of the as-spun fibers prepared by the combination of small-diameter nozzle and laser irradiation, high-strength and high-toughness PET fibers with the tensile strength of 1.68 GPa (12.1 cN/dtex) and the elongation at break of 9.1% was obtained. Numerical simulation of the melt spinning process incorporating the effects of nozzle diameter variation and laser irradiation heating indicated that the maximum Deborah number in the spin-line decreased by the applications of small diameter nozzle and laser irradiation heating. Accordingly, it was speculated that the variation of the state of molecular entanglement caused by the difference of polymer flow in the melt spinning process has significant effect on the mechanical properties of resultant fibers.