X‐ray small angle scattering of ramie and rayons
X‐ray small angle scattering of ramie and rayons
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苎麻和人造丝的 X 射线小角散射
DOI：
10.1002/pol.1953.120110506
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发表时间：
1953
期刊：
影响因子：
--
通讯作者：
A. Weidinger
中科院分区：
文献类型：
--
作者：
D. Heikens;P. Hermans;van Pf Velden;A. Weidinger
在真空照相机中，用单色光辐射，在空气干燥和水溶胀两种条件下，研究了苎麻和25个不同史前时期高度取向的人造丝样品的小角散射。给出了所有强度曲线。对于某些射线子，曲线在溶胀或干燥条件下显示出明显的最大值或拐点，这似乎表明存在叠加在正常下降的小角度强度曲线上的相对较低强度的最大值。对应于这些最大值的布拉格间距接近80埃。对于肿胀和50 A.干纤维的。其他标本要么没有显示这些叠加的最大值，要么只显示出它们存在的微弱迹象。最大值的存在（特别是在Fortisan、Fiber G、Super Cordura和Celanese K 36中）似乎表明，在某些人造丝中，纤维物质的一部分具有出乎意料的高规则性的胶束结构，并且具有由所示的布拉格间距给出的平均颗粒间距离。当用稀释体系的Guinier方法计算时，假定平行圆柱体为基本结构，没有出现最大值的膨胀试样的强度曲线在35-55 A之间。圆柱体的直径。根据Kratky建议的近似值（基于紧密堆积的lamantae图像）对强度曲线进行评估，指出存在相同数量级的优选间距（1040 A）。对于干燥和1060 A.肿胀的纤维没有明确的小角散射功能和其他已知属性的rayons之间的相关性已被检测到。
The small angle scattering of ramie and of 25 highly oriented rayon samples of widely different prehistory has been examined in both the air-dry and the water-swollen condition with monochromatic radiation in a vacuum camera. All intensity curves are given. For some rayons the curves show distinct maxima or inflection points in either the swollen or the dry condition which seem to be indicative of the existence of a maximum of relatively low intensity superimposed on a normally descending small angle intensity curve. The Bragg spacing corresponding to these maxima lies close to 80 A. for the swollen and to 50 A. for the dry fibers. Other specimens either do not show these superimposed maxima or show only faint indications of their occurrence. The existence of maxima (particularly pronounced in Fortisan, Fiber G, Super Cordura, and Celanese K 36) seems to demonstrate that in some rayons a part of the fiber substance has a micellar structure of unexpectedly high regularity and with average interparticle distances given by the Bragg spacings indicated. The intensity curves of those swollen specimens which did not exhibit a maximum, when evaluated by the Guinier method for dilute systems, assuming parallel cylinders as the basic structure, yield figures between 35–55 A. for the diameter of the cylinders. Evaluation of the intensity curves according to an approximation suggested by Kratky (based on the picture of closely packed lamellae) points to the existence of a preferred spacing of the same order of magnitude (∼40 A.) for the dry and of ∼60 A. for the swollen fibers. No clear correlation between small angle scattering features and other known properties of the rayons has been detected.