Influence of crystallinity and orientation on sonic velocity and birefringence in poly(ethylene terephthalate) fibers
Influence of crystallinity and orientation on sonic velocity and birefringence in poly(ethylene terephthalate) fibers
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聚对苯二甲酸乙二醇酯纤维结晶度和取向对声速和双折射的影响
DOI：
10.1002/pol.1968.160060414
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发表时间：
1968
期刊：
影响因子：
--
通讯作者：
J. Dumbleton
中科院分区：
文献类型：
--
作者：
J. Dumbleton
图 2. 拉伸非晶 PET 纱线的 l/Eor 与 A 的关系图。从 3 X 到 5.5 X。声波测量以 5 kc./sec 的频率进行。通过使用 KLH 脉冲传播计在 22°C 和 55% RH 下拉伸载荷为 0.05 g./den。被雇用。 X 射线结晶度测量采用 Dumbleton 和 Bwles 的方法进行。结晶区域的取向由 X 射线衍射仪在 (T05) 平面上的方位角扫描确定。使用的取向参数是 cos2+，其中+是晶体中的链轴与纤维轴之间的角度。该量是根据衍射峰的 __ 宽度计算的，假设峰形状为高斯型。 5 cos2 4 值用于确定方向函数 jc，其定义为
Fig. 2. Graph of l/Eor vs. A for drawn, amorphous PET yarns. from 3 X to 5.5 X. Sonic measurements were made at a frequency of 5 kc./sec. by using a KLH pulse propagation meter at 22 C. and 55% RH Tensile loads of 0.05 g./den. were employed. X-ray crystallinity measurements were made by the method of Dumbleton and B~ wles.~ The orientation of the crystalline regions was determined from x-ray diffractometer azimuthal scans on the (T05) plane. The orientation parameter used was cos2+, where+ is the angle between the chain axis in a crystal and the fiber axis. This quantity was calculated from the __ width of the diffraction peak as-suming that the peak shape was Gaussian. 5 The cos2 4 values were used to determine the orientation function, jc, which is defined as