2026-04-18T06:12:13Zhttps://recercat.cat/oai/request

oai:recercat.cat:10256/113812024-06-14T09:25:34Zcom_2072_452955com_2072_2054col_2072_453062

00925njm 22002777a 4500 dc Alcalà Vilavella, Manel author González Tovar, Israel author Boufi, Sami author Vilaseca Morera, Fabiola author Mutjé Pujol, Pere author info:eu-repo/date/embargoEnd/2026-01-01 info:eu-repo/date/embargoEnd/2026-01-01 2013 In the present work, nanofibrillated cellulose (NFC) from bleached eucalyptus pulp was prepared, characterized and used as reinforcement in an unbleached eucalyptus fiber matrix. First, the NFC was fabricated through TEMPO-mediated oxidation and characterized for the degree of polymerization, water retention value, cationic demand and carboxyl content. Intrinsic mechanical properties were also calculated by applying the rule of mixtures, which determines the coupling (f c) and efficiency factor (η e) of cellulose nanofibrils within the matrix. The results showed that the average intrinsic tensile strength and Young's modulus of NFC are estimated to be 6,919 MPa and 161 GPa, respectively. After characterization, the NFC was used as reinforcement in the preparation of biocomposites in the form of paper handsheets, which were physically and mechanically analyzed. The presence of NFC induced an increase in the density of biocomposites and significant enhancement of the mechanical properties as well as an important reduction in porosity. Finally, f c and η e were determined from the mean intrinsic properties The authors are thankful to the Spanish Ministry of Science and Innovation for the financial support given by the projects CTQ2010-21660-C03-03 and CTM2011-28506-C02-01 to develop this study http://hdl.handle.net/10256/11381 Fibres de cel·lulosa Cellulose fibers Materials nanoestructurats -- Propietats mecàniques Nanostructured materials -- Mechanical properties Pasta de paper Wood-pulp All-cellulose composites from unbleached hardwood kraft pulp reinforced with nanofibrillated cellulose