Scanning WAXS microscopy of regenerated cellulose fibers at mesoscopic resolution

IF 2.9 2区材料科学 Q2 CHEMISTRY, MULTIDISCIPLINARY

IUCrJ Pub Date : 2024-07-01 DOI:10.1107/S205225252400383X

Sara Johansson , Francesco Scattarella , Sebastian Kalbfleisch , Ulf Johansson , Christopher Ward , Crispin Hetherington , Herbert Sixta , Stephen Hall , Cinzia Giannini , Ulf Olsson , M. Takata (Editor)

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Abstract

Scanning WAXS microscopy of a regenerated cellulose textile fiber reveals a radial gradient in the degree of orientation of the crystallite.

In this work, regenerated cellulose textile fibers, Ioncell-F, dry-wet spun with different draw ratios, have been investigated by scanning wide-angle X-ray scattering (WAXS) using a mesoscopic X-ray beam. The fibers were found to be homogeneous on the 500 nm length scale. Analysis of the azimuthal angular dependence of a crystalline Bragg spot intensity revealed a radial dependence of the degree of orientation of crystallites that was found to increase with the distance from the center of the fiber. We attribute this to radial velocity gradients during the extrusion of the spin dope and the early stage of drawing. On the other hand, the fiber crystallinity was found to be essentially homogeneous over the fiber cross section.

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中观分辨率的再生纤维素纤维扫描 WAXS 显微镜。

在这项工作中，使用介观 X 射线束通过扫描广角 X 射线散射 (WAXS) 研究了采用不同牵伸比干湿纺的再生纤维素纺织纤维 Ioncell-F。研究发现，纤维在 500 纳米长度范围内是均匀的。对晶体布拉格光斑强度的方位角依赖性分析表明，晶体的取向程度与径向有关，并且随着与纤维中心距离的增加而增加。我们将此归因于在挤出纺丝涂料和拉丝早期阶段的径向速度梯度。另一方面，我们发现纤维的结晶度在纤维横截面上基本上是均匀的。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

IUCrJ CHEMISTRY, MULTIDISCIPLINARYCRYSTALLOGRAPH-CRYSTALLOGRAPHY

CiteScore

7.50

自引率

5.10%

发文量

审稿时长

10 weeks

期刊介绍： IUCrJ is a new fully open-access peer-reviewed journal from the International Union of Crystallography (IUCr). The journal will publish high-profile articles on all aspects of the sciences and technologies supported by the IUCr via its commissions, including emerging fields where structural results underpin the science reported in the article. Our aim is to make IUCrJ the natural home for high-quality structural science results. Chemists, biologists, physicists and material scientists will be actively encouraged to report their structural studies in IUCrJ.