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pH-responsive cellulose–chitosan nanocomposite films with slow release of chitosan
Mid Sweden University, Faculty of Science, Technology and Media, Department of Chemical Engineering.ORCID iD: 0000-0002-5178-367X
Mid Sweden University, Faculty of Science, Technology and Media, Department of Chemical Engineering.
Mid Sweden University, Faculty of Science, Technology and Media, Department of Chemical Engineering.ORCID iD: 0000-0002-5579-3373
Mid Sweden University, Faculty of Science, Technology and Media, Department of Chemical Engineering.
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2019 (English)In: Cellulose (London), ISSN 0969-0239, E-ISSN 1572-882X, Vol. 26, no 6, p. 3763-3776Article in journal (Refereed) Published
Abstract [en]

Cellulose–chitosan films were preparedusing a physical method in which cellulose andchitosan were separately dissolved via freeze thawingin LiOH/urea and mixed in different proportions, theresulting films being cast and regenerated in water/ethanol. X-ray diffraction and Fourier transforminfrared spectroscopy (FT-IR) spectroscopy verifiedthe composition changes in the nanocomposites due todifferent mixing ratios between the polymers. Tensilestress–strain measurements indicated that the mechan-ical performance of the cellulose–chitosan nanocom-posites slightly worsened with increasing chitosancontent compared with that of films comprisingcellulose alone. Field emission scanning electronmicroscopy revealed the spontaneous formation ofnanofibers in the films; these nanofibers were subse-quently ordered into lamellar structures. Water uptakeand microscopy analysis of film thickness changesindicated that the swelling dramatically increased atlower pH and with increasing chitosan content, thisbeing ascribed to the Gibbs–Donnan effect. Slowmaterial loss appeared at acidic pH, as indicated by aloss of weight, and quantitative FT-IR analysisconfirmed that chitosan was the main componentreleased.Asample containing 75% chitosan reached amaximum swelling ratio and weight loss of 1500%and 55 wt%, respectively, after 12 h at pH 3. Thestudy presents a novel way of preparing pH-responsivecellulose–chitosan nanocomposites with slow-releasecharacteristics using an environmentally friendlyprocedure and without any chemical reactions.

Place, publisher, year, edition, pages
2019. Vol. 26, no 6, p. 3763-3776
Keywords [en]
Cellulose dissolution, Chitosan dissolution, pH responsive, Gibbs–Donnan equilibrium, Nanocomposite, Slow release
National Category
Other Chemical Engineering
Identifiers
URN: urn:nbn:se:miun:diva-35778DOI: 10.1007/s10570-019-02357-5ISI: 000464849500011Scopus ID: 2-s2.0-85062686323OAI: oai:DiVA.org:miun-35778DiVA, id: diva2:1295641
Funder
Swedish Research Council Formas, 942-2015-251Available from: 2019-03-12 Created: 2019-03-12 Last updated: 2019-05-22Bibliographically approved

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Yang, JiayiDahlström, ChristinaEdlund, HåkanLindman, BjörnNorgren, Magnus

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