Rapid preparation of all-cellulose composites by solvent welding based on the use of aqueous solvent
Sirviö, J.A.; Visanko, M.; Hildebrandt, N.C. (2017-10-16)
J.A. Sirviö, M. Visanko, N.C. Hildebrandt, Rapid preparation of all-cellulose composites by solvent welding based on the use of aqueous solvent, In European Polymer Journal, Volume 97, 2017, Pages 292-298, ISSN 0014-3057, https://doi.org/10.1016/j.eurpolymj.2017.10.021. (http://www.sciencedirect.com/science/article/pii/S0014305717313745)
© 2017 Elsevier. All rights reserved. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http:/creativecommons.org/licenses/by-nc-nd/4.0/
https://rightsstatements.org/vocab/InC/1.0/
https://urn.fi/URN:NBN:fi-fe2017111450693
Tiivistelmä
Abstract
In the present study, the dissolution of softwood fibers and fabrication of all-cellulose composites was investigated using aqueous tetraethylammonium hydroxide solution (TEAOH, 35 wt%) at room temperature. The bulk of the cellulose fibers were instantly dissolved when mixed with the solvent, and suspensions up to 3 wt% were fabricated with ease. During the dissolution, a few remaining larger fiber flocks were fully dissolved within 3 h of mixing at room temperature. TEAOH was further studied in the production of all-cellulose composites by solvent welding (partial dissolution) of cellulose fiber sheets. Tensile strength of the original cellulose sheet increased from 3.3 to 55.0 MPa only after 30 s of room-temperature solvent welding, and an increase of over 23-fold (up to 76.7 MPa) was obtained by high-pressure-aided hot-pressing of the partially dissolved sheets before drying. The demonstrated fabrication of all-cellulose composites yielded many benefits in comparison to the current dissolution systems, such as short treatment time, ambient operation conditions, and readily applicable processing solutions, which makes it a potential methodology applicable even at an industrial scale.
Kokoelmat
- Avoin saatavuus [31941]