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New Solvent and Coagulating Agent for Development of Chitosan Fibers by Wet Spinning
Univ Borås, Swedish Ctr Resource Recovery, S-50190 Borås, Sweden..
Univ Borås, Swedish Ctr Resource Recovery, S-50190 Borås, Sweden..
KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Fibre- and Polymer Technology.
Univ Borås, Swedish Ctr Resource Recovery, S-50190 Borås, Sweden..
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2021 (English)In: Polymers, E-ISSN 2073-4360, Vol. 13, no 13, p. 2121-, article id 2121Article in journal (Refereed) Published
Abstract [en]

Adipic acid was evaluated as a novel solvent for wet spinning of chitosan fibers. A solvent with two carboxyl groups could act as a physical crosslinker between the chitosan chains, resulting in improved properties of the fibers. The performance of adipic acid was compared with conventional solvents, i.e., lactic, citric, and acetic acids. Chitosan solutions were injected into a coagulation bath to form monofilaments. Sodium hydroxide (NaOH) and its mixture with ethanol (EtOH) were used as coagulation agents. Scanning electron microscopy confirmed the formation of uniform chitosan monofilaments with an even surface when using adipic acid as solvent. These monofilaments generally showed higher mechanical strength compared to that of monofilaments produced using conventional solvents. The highest Young's modulus, 4.45 GPa, was recorded for adipic acid monofilaments coagulated in NaOH-EtOH. This monofilament also had a high tensile strength of 147.9 MPa. Furthermore, taking advantage of chitosan insolubility in sulfuric acid (H2SO4) at room temperature, chitosan fibers were successfully formed upon coagulation in H2SO4-EtOH. The dewatering of fibers using EtOH before drying resulted in a larger fiber diameter and lower mechanical strength. Adipic acid fibers made without dehydration illustrated 18% (for NaOH), 46% (for NaOH-EtOH), and 91% (for H2SO4-EtOH) higher tensile strength compared to those made with dehydration.

Place, publisher, year, edition, pages
MDPI AG , 2021. Vol. 13, no 13, p. 2121-, article id 2121
Keywords [en]
monofilament, chitosan, adipic acid, wet spinning, sulfuric acid, coagulation bath
National Category
Bio Materials
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URN: urn:nbn:se:kth:diva-299052DOI: 10.3390/polym13132121ISI: 000670961500001PubMedID: 34203312Scopus ID: 2-s2.0-85109411881OAI: oai:DiVA.org:kth-299052DiVA, id: diva2:1582351
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QC 20210730

Available from: 2021-07-30 Created: 2021-07-30 Last updated: 2024-01-17Bibliographically approved

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Adolfsson, Karin H.Hakkarainen, Minna

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