2026-04-17T05:17:19Zhttps://recercat.cat/oai/request

oai:recercat.cat:10256/224722024-06-18T12:07:47Zcom_2072_452955com_2072_2054col_2072_453062

00925njm 22002777a 4500 dc Najahi, Amira author Tarrés Farrés, Joaquim Agustí author Mutjé Pujol, Pere author Delgado Aguilar, Marc author Putaux, Jean-Luc author Boufi, Sami author 2022-12-26 Lignin-containing cellulose nanofibrils (LCNFs) have emerged as a new class of nanocelluloses where the presence of residual lignin is expected to impart additional attributes such as hydrophobicity or UV-absorption. In the present work, LCNFs with a lignin content between 7 and 15 wt% were prepared via a TEMPO-mediated oxidation as chemical pretreatment followed by high-pressure homogenization. The impact of the carboxyl content (CC) on the properties of the resulting LCNF gel, in terms of lignin content, colloidal properties, morphology, crystallinity, and thermal stability, were investigated. It was found that lignin content was significantly decreased at increasing CC. In addition, CC had a positive effect on colloidal stability and water contact angle, as well as resulting in smaller fibrils. This lower size, together with the lower lignin content, resulted in a slightly lower thermal stability. The reinforcing potential of the LCNFs when incorporated into a ductile polymer matrix was also explored by preparing nanocomposite films with different LCNF contents that were mechanically tested under linear and non-linear regimes by dynamic mechanical analysis (DMA) and tensile tests. For comparison purposes, the reinforcing effect of the LCNFs with lignin-free CNFs was also reported based on literature data. It was found that lignin hinders the network-forming capacity of LCNFs, as literature data shows a higher reinforcing potential of lignin-free CNFs. Nonetheless, the tensile strength of the acrylic matrix was enhanced by 10-fold at 10 wt% of LCNF content This research was funded by Erasmus Program Erasmus +KA107 and the Spanish Ministry of Science and Innovation, to the project CON-FUTURO-ES (PID2020-113850RB-C22) http://hdl.handle.net/10256/22472 Materials nanoestructurats Nanostructured materials Lignocel·lulosa Lignocellulose Lignin-Containing Cellulose Nanofibrils from TEMPO-Mediated Oxidation of Date Palm Waste: Preparation, Characterization, and Reinforcing Potential