期刊
CELLULOSE
卷 28, 期 5, 页码 2779-2789出版社
SPRINGER
DOI: 10.1007/s10570-021-03711-2
关键词
Regenerated cellulose fibers; SAXS/WAXS; Crystal shape; Crystal orientation
资金
- Swedish Research Council
- COST Action STSM [FP1205]
This study presents a new understanding of the colloidal structure of regenerated cellulose fibers through SAXS analysis, revealing oriented crystalline lamellae embedded within an amorphous cellulose matrix. The data suggests a different fiber structure than previously assumed, with lamellae oriented parallel to the fiber axis.
We present a small angle X-ray scattering (SAXS) study of the colloidal structure of regenerated cellulose fibers, air-gap spun from an ionic liquid solution. Based on the data, and a different interpretation of the anisotropic SAXS pattern, we propose a slightly different colloidal structure of the fibers, than what is commonly assumed for regenerated cellulose fibers. Fibers with two different degrees of orientation, as produced by different draw ratios, DR = 2 and 15, respectively, are analyzed. The 2D SAXS pattern is highly anisotropic with striking cross-like pattern, having scattering predominantly perpendicular and parallel to the fiber axis. This cross-like pattern suggest a colloidal structure with oriented crystalline lamellae of ca. 10 nm thickness, embedded within a continuous matrix of amorphous cellulose. The lamellae are oriented with their normal parallel with the fiber axis. Complementary wide angle X-ray diffraction data confirm that the lamellae normal direction corresponds to the cellulose chain direction (c-direction) in the monoclinic cellulose crystal (Cellulose II). [GRAPHICS]
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