Cellulose and chitin composite materials from an ionic liquid and a green co-solvent
| Autor: | Werner Kunz, Cordt Zollfrank, Auriane Freyburger, Yaqing Duan |
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| Rok vydání: | 2018 |
| Předmět: |
Materials science
Polymers and Plastics Organic Chemistry 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences Chitosan Contact angle Crystallinity chemistry.chemical_compound chemistry Chitin Ionic liquid Materials Chemistry Cellulose Fourier transform infrared spectroscopy Composite material 0210 nano-technology Dissolution |
| Zdroj: | Carbohydrate Polymers. 192:159-165 |
| ISSN: | 0144-8617 |
| DOI: | 10.1016/j.carbpol.2018.03.045 |
| Popis: | We report on a method for the preparation of cellulose/chitin composite materials from the ionic liquid 1-butyl-3-methylimidazolium acetate and γ-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. |
| Databáze: | OpenAIRE |
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