Duan, Yaqing and Freyburger, Auriane and Kunz, Werner and Zollfrank, Cordt (2018) Cellulose and chitin composite materials from an ionic liquid and a green co-solvent. CARBOHYDRATE POLYMERS, 192. pp. 159-165. ISSN 0144-8617, 1879-1344
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We report on a method for the preparation of cellulose/chitin composite materials from the ionic liquid 1-butyl-3-methylimidazolium acetate and gamma-valerolactone as a biosourced sustainable co-solvent. Element analysis and attentuated total reflectance Fourier transform infrared spectroscopy show that the average degree of acetylation of chitin in the composite materials was around 82.5%. This indicates that chitin is not deacetylated to chitosan during the dissolution process. The X-ray diffraction results show that the degree of crystallinity of the composite materials increases from amorphous to 59% with increasing chitin concentration accompanied by a developing crystallite size up to 3 nm. Mechanical testing yielded a maximum tensile stress of 4.7 MPa, an elastic modulus of 27.4 MPa and a breaking elongation of 78.7% for the composites with 80 wt% chitin. In addition, water contact angle measurements indicated that the presence of chitin rendered the materials more hydrophobic.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | INFRARED-SPECTROSCOPY; NANOCOMPOSITE FILMS; CHITOSAN; WATER; DEACETYLATION; HYDROGELS; PLATFORM; BIOMASS; Cellulose/chitin composite; Ionic liquid; Gamma-valerolactone; Degree of acetylation; Crystallinity index; Mechanical property |
| Subjects: | 500 Science > 540 Chemistry & allied sciences |
| Divisions: | Chemistry and Pharmacy > Institut für Physikalische und Theoretische Chemie Chemistry and Pharmacy > Institut für Physikalische und Theoretische Chemie > Chair of Chemistry VI - Physical Chemistry (Solution Chemistry) > Prof. Dr. Werner Kunz |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 06 Mar 2020 07:43 |
| Last Modified: | 06 Mar 2020 07:43 |
| URI: | https://pred.uni-regensburg.de/id/eprint/14235 |
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