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首页> 外文期刊>Journal of Applied Polymer Science >HIGH-PERFORMANCE PET FIBERS VIA LIQUID ISOTHERMAL BATH HIGH-SPEED SPINNING - FIBER PROPERTIES AND STRUCTURE RESULTING FROM THREADLINE MODIFICATION AND POSTTREATMENT
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HIGH-PERFORMANCE PET FIBERS VIA LIQUID ISOTHERMAL BATH HIGH-SPEED SPINNING - FIBER PROPERTIES AND STRUCTURE RESULTING FROM THREADLINE MODIFICATION AND POSTTREATMENT

机译：通过液体等温浴的高性能PET纤维高速纺丝-线改性和后处理产生的纤维特性和结构

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Poly(ethylene terephthalate) fibers with improved mechanical properties and dimensional stability were spun via controlled threadline dynamics by a liquid isothermal bath (LIB) spinning process: followed by postdrawing and annealing. Control fibers were made by unperturbed spinning and posttreatment similar to a traditional spin-draw process. The two sets of as-spun fibers were spun at take-up speed in the range of 2000-5000 m/min. Fiber properties of the as-spun fibers and posttreated fibers of each process were compared. Two commercial tire cords, i.e., conventional tire cord and low shrinkage tire cord, were also included. Unlike unperturbed spinning, the LIB as-spun fibers show unique structural properties of high amorphous orientation, low crystallinity, high strength, and high initial modulus. Moreover, noncrystalline chains are further extended during posttreatment. The posttreated LIB fibers exhibit mechanical properties with tenacity higher than approximately 9 g/d, initial modulus higher than 120 g/d, and ultimate elongation less than approximately 10%. They also demonstrate superior dimensional stability with thermal shrinkage less than 6% and LASE-5 higher than 5 g/d. The overall properties are not obtainable by either the traditional spin-draw process or any modified process that produces low shrinkage tire cord. Unlike the case fbr unperturbed fibers, the mechanical properties of the posttreated LIB fibers demonstrate a strong/dependency on the birefringence of their respective as-spun fibers. There are at least three significant pieces of evidence that strongly indicate the existence of a third phase, referred to as the taut-tie noncrystalline phase (TTNC), in addition to the traditional two-phase model, i.e., crystalline and random amorphous phases. A unique feature involving a high fraction of taut-tie noncrystalline phase (TTNC %) in the LIB as-spun and the posttreated fibers is also found and which is, in fact, achieved neither by the traditional spin-draw nor the commercial tire cord processes. Further, different from the posttreated unperturbed fibers, the posttreated LIB fibers have an enhanced fraction of taut-tie noncrystalline chains with shorter length, which is believed to be one of the important factors leading to the superior mechanical properties and excellent dimensional stability achieved. (C) 1997 John Wiley & Sons, Inc. [References: 37]
机译：通过液体等温浴（LIB）纺丝工艺通过受控的线动力学，纺出具有改善的机械性能和尺寸稳定性的聚对苯二甲酸乙二酯纤维：随后进行后拉伸和退火。对照纤维是通过与传统的旋转拉伸工艺相似的无扰纺丝和后处理制成的。将两组初纺纤维以2000-5000m / min的卷取速度纺丝。比较了每种方法的初纺纤维和后处理纤维的纤维性能。还包括两条商业轮胎帘线，即常规轮胎帘线和低收缩轮胎帘线。与无扰纺丝不同，LIB初纺纤维显示出独特的结构特性，即高非晶取向，低结晶度，高强度和高初始模量。此外，非晶链在后处理期间进一步延伸。后处理的LIB纤维表现出机械性能，强度大于约9 g / d，初始模量大于120 g / d，极限伸长率小于约10％。它们还显示出优异的尺寸稳定性，热收缩率低于6％，LASE-5高于5 g / d。通过传统的旋转拉伸工艺或任何产生低收缩轮胎帘线的改进工艺都无法获得总体性能。与未扰动纤维的情况不同，后处理的LIB纤维的机械性能表现出强烈的/依赖性，取决于它们各自初纺纤维的双折射。除传统的两相模型（即结晶相和无定形相）外，至少有三个重要的证据有力地表明存在第三相，称为拉紧非结晶相（TTNC）。还发现了一个独特的特征，包括在纺制的LIB和后处理的纤维中有很高比例的拉紧非结晶相（TTNC％），实际上，这既不能通过传统的旋转拉伸方法也不能通过商业轮胎帘线实现流程。此外，不同于后处理的未扰动纤维，后处理的LIB纤维具有提高的具有较短长度的拉紧非结晶链部分，这被认为是导致获得优异的机械性能和优异的尺寸稳定性的重要因素之一。 （C）1997 John Wiley＆Sons，Inc. [参考：37]

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