2026-04-18T07:01:55Zhttps://recercat.cat/oai/request

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

2024-06-14T09:25:34Z urn:hdl:10256/11381 All-cellulose composites from unbleached hardwood kraft pulp reinforced with nanofibrillated cellulose Alcalà Vilavella, Manel González Tovar, Israel Boufi, Sami Vilaseca Morera, Fabiola Mutjé Pujol, Pere Fibres de cel·lulosa Cellulose fibers Materials nanoestructurats -- Propietats mecàniques Nanostructured materials -- Mechanical properties Pasta de paper Wood-pulp 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 2024-06-14T09:25:34Z 2024-06-14T09:25:34Z info:eu-repo/date/embargoEnd/2026-01-01 info:eu-repo/date/embargoEnd/2026-01-01 2013 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion http://hdl.handle.net/10256/11381 info:eu-repo/semantics/altIdentifier/doi/10.1007/s10570-013-0085-2 info:eu-repo/semantics/altIdentifier/issn/0969-0239 info:eu-repo/semantics/altIdentifier/eissn/1572-882X info:eu-repo/grantAgreement/MICINN//CTM2011-28506-C02-01/ES/NUEVOS BIO-MATERIALES A PARTIR DE CELULOSA MICROFIBRILADA Y CELULOSA BACTERIANA/ info:eu-repo/grantAgreement/MICINN//CTQ2010-21660-C03-03/ES/PROCESO SOSTENIBLE DE OBTENCION DE PASTAS CELULOSICAS A PARTIR DE RESIDUOS AGRICOLAS PROCEDENTES DE LA PODA DE CITRICOS Y DE TALLOS DE COLZA/ Tots els drets reservats info:eu-repo/semantics/embargoedAccess Springer Verlag © Cellulose, 2013, vol. 20, núm. 6, p. 2909-2921 Articles publicats (D-EQATA)