University of Oulu

Sirviö, J. A., & Lakovaara, M. (2021). A Fast Dissolution Pretreatment to Produce Strong Regenerated Cellulose Nanofibers via Mechanical Disintegration. Biomacromolecules, 22(8), 3366–3376.

A fast dissolution pretreatment to produce strong regenerated cellulose nanofibers via mechanical disintegration

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Author: Sirviö, Juho Antti1; Lakovaara, Matias1
Organizations: 1Fibre and Particle Engineering Research Unit, University of Oulu, P.O. Box 4300, 90014 Oulu, Finland
Format: article
Version: published version
Access: open
Online Access: PDF Full Text (PDF, 3.4 MB)
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Language: English
Published: American Chemical Society, 2021
Publish Date: 2021-08-17


This study investigates a fast dissolution and regeneration pretreatment to produce regenerated cellulose nanofibers (RCNFs) via mechanical disintegration. Two cellulose pulps, namely, birch and dissolving pulps, with degree of polymerizations of 1800 and 3600, respectively, were rapidly dissolved in dimethyl sulfoxide (DMSO) by using tetraethylammonium hydroxide (TEAOH) as aqueous electrolyte at room temperature. When TEAOH (35 wt % in water) was added to the pulp–DMSO dispersion (pulp:DMSO and TEAOH:DMSO weight ratios of 1:90 and 1:9, respectively), 95% of the dissolving pulp and 85% of the birch pulp fibers dissolved almost immediately. Addition of water caused the regeneration of cellulose without any chemical modification and only a minor decrease of DP, whereas the crystallinity structure of cellulose transformed from cellulose I to cellulose II. The regenerated cellulose could then be mechanically disintegrated into nanosized fibers with only a few passes through a microfluidizer, and RCNF showed fibrous structure. The specific tensile strength of the film produced from both RCNFs exceeded 100 kN·m/kg, and overall mechanical properties of RCNF produced from birch pulp were in line with reference CNF produced by using extensive mechanical disintegration. Although the thermal stability of RCNFs was slightly lower compared to their corresponding original cellulose pulp, the onset temperature of degradation of RCNFs was over 270 °C.

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Series: Biomacromolecules
ISSN: 1525-7797
ISSN-E: 1526-4602
ISSN-L: 1525-7797
Volume: 22
Issue: 8
Pages: 3366 - 3376
DOI: 10.1021/acs.biomac.1c00466
Type of Publication: A1 Journal article – refereed
Field of Science: 221 Nanotechnology
Funding: J.A.S. thanks the Kone Foundation for its financial support.
Copyright information: © 2021 The Authors. Published by American Chemical Society. CC BY.