Development of oriented morphology and tensile properties upon superdawing of solution-spun fibers of ultra-high molecular weight poly(acrylonitrile)
Development of oriented morphology and tensile properties upon superdawing of solution-spun fibers of ultra-high molecular weight poly(acrylonitrile)
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DOI：
10.1016/j.polymer.2006.03.067
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发表时间：
2006-05-31
期刊：
影响因子：
4.6
通讯作者：
Kanamoto, Tetsuo
中科院分区：
文献类型：
--
作者：
Sawai, Daisuke;Fujii, Yuya;Kanamoto, Tetsuo
研究了不同温度下甲醇凝固浴对聚丙烯腈（PAN）纤维的单轴拉伸，以及拉伸后纤维的结构和拉伸性能。虽然在较低拉伸比（DRt）范围内的纤维的初始形态和变形模式显着依赖于凝固浴的温度，在给定的DRt的拉伸性能，以及最大实现的，是可比的。拉伸模量和强度都随着DR t的增加而稳步增加，在最高DR t接近80时分别达到35和1.8 GPa。这些拉伸性能是PAN纤维有史以来最高的。超拉伸纤维获得如此高的拉伸性能是由于随着DR t的增加，结晶链的构象从3/1螺旋转变为平面锯齿形，纤维直径沿纤维轴向沿着的均匀性得到改善，以及纤维直径减小。事实上，从稀溶液制备的纤维的拉伸强度，并具有相当的模量随着纤维直径的减小而增加。根据Griffith理论，强度的倒数与直径的平方根成正比。外推到零直径，对于具有35 +/-1GPa的最大实现拉伸模量的纤维，得到2.4 +/-0.1GPa的极限拉伸强度。(c)2006爱思唯尔有限公司版权所有。
The uniaxial drawing of UHMW-PAN fibers spun from a dilute solution into methanol coagulation baths at different temperatures and the resultant structure and tensile properties of the drawn products were studied. Although the initial morphology of the fibers and the deformation mode in a lower draw ratio (DRt) range were significantly dependent on the temperatures of the coagulation bath, the tensile properties at a given DRt, as well as the maximum achieved ones, were comparable. Both the tensile modulus and strength increased steadily with the DRt and reached 35 and 1.8 GPa, respectively, at the highest DRt of similar to 80. These tensile properties are among the highest ever reported for PAN fibers. The achievement of such high tensile properties for extremely drawn fibers is ascribed to the conformational changes of crystalline chains from the 3/1 helix to the planar-zigzag with increasing DRt, the improvement in the uniformity of the fiber diameter along the fiber axis, and the decrease in fiber diameter. Indeed, the tensile strength of fibers prepared from a dilute solution and having comparable moduli increased with a decrease in the fiber diameters. The reciprocal of the strength was proportional to the square root of the diameter as suggested by the Griffith theory. Extrapolation to a zero diameter yielded an ultimate tensile strength of 2.4 +/- 0.1 GPa for a fiber having a maximum achieved tensile modulus of 35 +/- 1 GPa. (c) 2006 Elsevier Ltd. All rights reserved.