2026-04-03T23:55:21Zhttps://recercat.cat/oai/request

oai:recercat.cat:10256/212282024-06-18T12:07:08Zcom_2072_452955com_2072_2054col_2072_453062

2024-06-18T12:07:08Z urn:hdl:10256/21228 Improved Process to Obtain Nanofibrillated Cellulose (CNF) Reinforced Starch Films with Upgraded Mechanical Properties and Barrier Character Granda Garcia, Luis Angel Oliver Ortega, Helena Fabra, Maria José Tarrés Farrés, Joaquim Agustí Pèlach Serra, Maria Àngels Lagarón, José Maria Méndez González, José Alberto Nanocompòsits (Materials) -- Biodegradació Nanocomposites (Materials) -- Biodegradation Fibres de cel·lulosa Cellulose fibers Biopolímers Biopolymers Midó Starch Plàstics reforçats amb fibra Fiber-reinforced plastics Aliments -- Embalatge -- Materials Food -- Packing -- Materials Nowadays, the interest on nanofibrillated cellulose (CNF) has increased owing to its sustainability and its capacity to improve mechanical and barrier properties of polymeric films. Moreover, this filler shows some drawbacks related with its high capacity to form aggregates, hindering its dispersion in the matrix. In this work, an improved procedure to optimize the dispersability of CNF in a thermoplastic starch was put forward. On the one hand, CNF needs a hydrophilic dispersant to be included in the matrix, and on the other, starch needs a hydrophilic plasticizer to obtain a thermoformable material. Glycerol was used to fulfil both targets at once. CNF was predispersed in the plasticizer before nanofibrillation and later on was included into starch, obtaining thin films. The tensile strength of these CNF–starch composite films was 60% higher than the plain thermoplastic starch at a very low 0.36% w/w percentage of CNF. The films showed a noticeable correlation between water uptake, and temperature and humidity. Regarding permeability, a ca. 55% oxygen and water vapor permeability drop was found by nanofiller loading. The hydrolytic susceptibility of the composite was confirmed, being similar to that of the thermoplastic starch This research was funded by University of Girona through the Program of the Improvement of the Scientific Production and the MINECO project AGL2015-63855-C2-1-R 2024-06-18T12:07:08Z 2024-06-18T12:07:08Z 2020-05-07 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion peer-reviewed http://hdl.handle.net/10256/21228 info:eu-repo/semantics/altIdentifier/doi/10.3390/polym12051071 info:eu-repo/semantics/altIdentifier/eissn/2073-4360 Attribution 4.0 International http://creativecommons.org/licenses/by/4.0/ info:eu-repo/semantics/openAccess MDPI (Multidisciplinary Digital Publishing Institute) Polymers, 2020, vol. 12, núm. 5, p. 1071 Articles publicats (D-EQATA)