| Autor: |
Jiang, Yiwei, Moradian, Mohammadhadi, Nutu, Oana M., Ojagh, Seyed Mohammad Amin, van de Ven, Theo G. M. |
| Zdroj: |
Industrial & Engineering Chemistry Research; November 2024, Vol. 63 Issue: 45 p19537-19545, 9p |
| Abstrakt: |
Films commonly used in food packaging are often derived from petroleum-based plastics, which pose a threat to the environment due to them being nonbiodegradable and nonecological. Herein, we present an approach wherein robust and flexible cellulose-based films were continuously generated using a flow casting method, involving the extrusion of dope through a slit, followed by resolidification in acid. The extruded films were deposited on a conveyor belt submerged in an acid bath and capable of operating at speeds up to 7 cm/s. The morphological and physiochemical properties of films were assessed using field emission scanning electron microscopy, solid-state 13C NMR, and X-ray diffraction (XRD). XRD analysis revealed that carboxymethylated cellulose films regenerated at higher extrusion speeds exhibited a higher alignment in the orientation of cellulose crystals. The tensile stress of the film increased from 105 to 125 MPa as the speed of the conveyor belt increased from 0.8 to 7 cm/s. Notably, the tensile strength in the belt direction (BD) (125 MPa) is significantly higher (125 MPa) than the tensile stress in the cross direction (76 MPa). This difference confirms the anisotropic nature of the films, with cellulose chains preferentially aligning along the BD, as well as the specific crystallographic planes (11̅0) and (110). |
| Databáze: |
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