Effect of adsorption of polyethylene glycol (PEG), in aqueous media, to improve cellulose nanostructures stability

• Published in: Journal of molecular liquids Vol. 268; pp. 415 - 424
• Main Authors: de Lima, Giovanni F., de Souza, Alana G., Rosa, Derval S.
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 15-10-2018
• ISSN: 0167-7322; 1873-3166
• DOI: 10.1016/j.molliq.2018.07.080

In recent year, the interest in environmentally friendly materials, like cellulose nanostructures (CNSs) has increased. Nanoscale dimensions, high surface area, low density, and high mechanical strength are examples of CNSs properties that attract researchers' attention. CNSs stability and dispersity are the main limitations that prevent its application as nanofiller in polymeric matrices. In this work, the surface modification of CNSs was investigated. To overcome CNSs limitation, they were modified with polyethylene glycol (PEG), in aqueous solution, in different proportions: 2, 5 and 10 wt%. FTIR, elemental analysis, NMR, and XPS were carried out to verify the adsorption efficiency. The results showed an excellent adsorption of PEG chains on the CNSs surface, with particle size increase of 50–90 nm and a considerable increase in thermal stability. XRD and AFM analysis observed no significant variation in crystallinity and morphology in modified CNSs. Thus, modification of CNSs with PEG is an environmentally friendly process and showed positive results regarding improving CNSs stability, in aqueous media.
•PEG was successfully adsorbed onto cellulose nanostructures (CNS) surface in solution.•PEG dosage of 2% showed the best results for improving CNS dispersity.•Stabilization with PEG is an environmentally friendly methodology to improve CNS stability.•CNS crystallinity and morphology were not affected by the adsorption of PEG.