The colloidal structure of a cellulose fiber

Research output: Contribution to journalArticle

Abstract

Abstract: 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). Graphic abstract: [Figure not available: see fulltext.].

Details

Authors
  • Marta Gubitosi
  • Shirin Asaadi
  • Herbert Sixta
  • Ulf Olsson
Organisations
External organisations
  • Aalto University
  • Lund University
Research areas and keywords

Subject classification (UKÄ) – MANDATORY

  • Physical Chemistry

Keywords

  • Crystal orientation, Crystal shape, Regenerated cellulose fibers, SAXS/WAXS
Original languageEnglish
Pages (from-to)2779-2789
JournalCellulose
Volume28
Issue number5
Early online date2021 Feb 8
Publication statusPublished - 2021
Publication categoryResearch
Peer-reviewedYes