FIBER STRUCTURE FORMATION IN HIGH SPEED MELT SPINNING OF POLY(ETHYLENE TEREPHTHALATE)
FIBER STRUCTURE FORMATION IN HIGH SPEED MELT SPINNING OF POLY(ETHYLENE TEREPHTHALATE)
复制标题
聚对苯二甲酸乙二醇酯高速熔融纺丝中纤维结构的形成
DOI：
10.2115/fiber.40.6_t177
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发表时间：
1984
期刊：
影响因子：
--
通讯作者：
N. Okui
中科院分区：
文献类型：
--
作者：
J. Shimizu;T. Kikutani;A. Takaku;N. Okui
本文用广角X射线衍射分析研究了在1000- 9000 m/min速度下高速熔纺PET长丝的取向精细结构。以4000 m/min纺制的长丝的WAXS图案显示赤道上的漫反射，这表明聚合物处于无定形状态，尽管具有相当大的分子取向度。换句话说，这可以被称为“定向中间相”。通过X射线强度分离程序，估计了丝中的三个相：结晶相、取向中间相和非晶相的量。在1000 ~ 4000 m/min的卷绕速度范围内，取向中间相的数量显著增加，在4000 m/min时达到最大值，从5000 m/min开始取向诱导结晶，取向中间相的数量随着结晶的进行而减少，而结晶相和取向中间相的总量从1000到7000 m/s连续增加。这些结果表明，取向的分子在中间相中选择性地聚集，然后引发晶体的成核。结晶取向因子比不经解析处理的高。结晶取向因子随着从5000到8000 m/min的卷绕速度的增加而增加。已知拉伸纤维中PET晶体的c轴并不完全平行于纤维轴对齐，但它们都相对于纤维轴以大约相同的量和相同的方向倾斜。对于高速纺PET长丝，随着卷绕速度的增加，倾斜角减小，分子向倾斜方向的优先取向程度增加。
Oriented fine structures of high speed melt spun PET filaments obtained at 1000-9000m/min were investigated by Wide-angle X-ray analysis. WAXS pattern for the filaments spun at 4000m/min shows diffuse reflection on the equator which suggests that the polymer is in an amorphous state, in spite of considerable degree of molecular orientation. In other words, this might be called an “oriented mesophase”. The amount of three phases in the filament; crystalline phase, oriented mesophase and amorphous phase, was estimated through the X-ray intensity separation procedures. In the range of take-up velocity from 1000 to 4000m/min, the amount of oriented mesophase increases remarkably and shows the maximum at 4000m/min. The orientation induced crystallization starts from 5000m/min. The amount of the oriented mesophase decreases as the crystallization proceeds, whereas the sum of the amount of crystalline phase and oriented mesophase increases continuously from 1000 to 7000m/min. These results suggest that oriented molecules in the mesophase selectively aggregate and then initiate the nucleation of crystals.Resolution of the azimuthal intensity curves into the crystalline and the oriented mesophase components yield the higher crystalline orientation factors than those obtained without resolving procedures. The crystalline orientation factor increases with increasing take-up velocity from 5000 to 8000m/min. It is known that c-axes of PET crystals in the drawn fibers are not aligned exactly parallel to the fiber axis, but they are all tilted with about the same amount and in the same direction with respect to the fiber axis. For the high speed spun PET filaments, the tilt angle decreases and the degree of preferential molecular orientation toward the tilt direction becomes higher with increasing take-up velocity.