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Published in: Cellulose 17/2022

19-09-2022 | Original Research

Characterization of solid-state structures, molar masses, and microfibril structures of cellulose in never-dried cotton fibers and ramie bast fibers

Authors: Yuko Ono, Miyuki Takeuchi, Akira Isogai

Published in: Cellulose | Issue 17/2022

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Abstract

Commercial cellulose is dried and/or hydrothermally treated under various conditions during isolation and purification. These processes may influence the structures and properties of the resulting cellulose products. In the present study, never-dried ramie and cotton cellulose samples were prepared from ramie bast and cotton fibers by delignification and KOH treatment. The neutral sugar compositions, X-ray diffraction (XRD) patterns, solid-state carbon 13 nuclear magnetic resonance (13C-NMR) spectra, and molar masses of the cellulose samples were determined to elucidate their chemical and crystal structures. Transmission electron microscopy (TEM) and atomic force microscopy (AFM) images of TEMPO-oxidized cellulose nanofibrils prepared from the cellulose samples were examined to determine their microfibril structures and morphologies (TEMPO = 2,2,6,6-tetramethylpiperidine-1-oxyl radical). The highest post-treatment glucose contents of the ramie and cotton cellulose samples were 93 and 98%, respectively. Cellulose I crystal widths in the ramie and cotton cellulose samples, calculated from their XRD patterns, were 3.5–3.8 and 4.6–5.1 nm, respectively. The ramie and cotton cellulose samples produced by pre-treating the never-dried samples under suitable conditions had higher molar masses than commercial products. The fibril widths determined from the AFM height images of the TEMPO-oxidized cellulose nanofibrils prepared from the never-dried ramie and cotton cellulose samples were 2.8 ± 0.7 and 3.1 ± 0.8 nm, respectively. These values were smaller than those of commercial ramie and cotton cellulose fibers. Therefore, the large cellulose I crystal widths found in commercial ramie and cotton cellulose fibers may result from the drying conditions of those fibers during production.

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Appendix
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Metadata
Title
Characterization of solid-state structures, molar masses, and microfibril structures of cellulose in never-dried cotton fibers and ramie bast fibers
Authors
Yuko Ono
Miyuki Takeuchi
Akira Isogai
Publication date
19-09-2022
Publisher
Springer Netherlands
Published in
Cellulose / Issue 17/2022
Print ISSN: 0969-0239
Electronic ISSN: 1572-882X
DOI
https://doi.org/10.1007/s10570-022-04835-9

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