Enhancement of mechanical and thermal properties of Ixora coccinea L. plant root derived nanocellulose using polyethylene glycol-glutaraldehyde system

• Published in: Chemosphere (Oxford) Vol. 298; p. 134324
• Main Authors: Unni, Rekha, Reshmy, R., Latha, M.S., Philip, Eapen, Sindhu, Raveendran, Binod, Parameswaran, Pandey, Ashok, Awasthi, Mukesh Kumar
• Format: Journal Article
• Language: English
• Published: England Elsevier Ltd 01-07-2022
• Subjects: Biopolymers; Glutaraldehyde; Nanocellulose; Tensile properties; Thermogravimetric analysis; Nanocellulose; Glutaraldehyde; Thermogravimetric analysis; Biopolymers; Tensile properties
• ISSN: 0045-6535; 1879-1298
• DOI: 10.1016/j.chemosphere.2022.134324

Nanocellulose fibers are widely acknowledged as a more sustainable alternative to polyimide and polyethylene terephthalate-based plastic films derived from petrochemicals. Cellulose is also utilised in packaging, tissue engineering, electronic, optical, and sensor applications, pharmaceutical applications, cosmetic applications, insulation, water filtration, and hygiene applications, as well as vascular grafts. In the present study to improve the tensile and thermal properties of cellulose nanofibers, polyethylene glycol (PEG 600) with varying concentrations was produced by solvent casting and chemically crosslinked with glutaraldehyde (GA). The effects of various PEG 600 concentrations on nanofibers and the morphology of the resulting nanofibers were investigated. The effects of GA on PEG-nanocellulose morphology, average diameter, tensile strength, elongation, and thermal characteristics were investigated. Strong (GA)-based acetal linkages are used to substitute secondary hydrogen bonds in nanocellulose films. The 1% PEG 600 plasticized nanocellulose scaffolds cross-linked with GA showed a higher tensile modulus (93 MPa) than its GA untreated nanocellulose scaffolds (69 MPa). The Young's modulus of the scaffold is increased up to 83.62 MPa. The crystallinity index values of GA-treated scaffolds were increased, and the mechanical characteristics were greatly improved, according to Fourier transform infrared (FTIR) and XRD analysis on the films. The thermogravimetric analysis (TG/DTG/DSC) of the GA treated plasticized nanocellulose scaffold showed maximum decomposition temperature (Tmax) at 360.01 °C.
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•Nanocellulose fibers are extracted from the plant roots of Ixora coccinea L.•Fabricated with solvent casting process, plasticized with PEG 600, and glutaraldehyde crosslinked.•Tensile modulus of 1% PEG 600 plasticized nanocellulose scaffolds cross-linked with GA was greater (93 MPa).•The thermogravimetric analysis of the scaffold showed Tmax at 360.01 °C.