Improved Process to Obtain Nanofibrillated Cellulose (CNF) Reinforced Starch Films with Upgraded Mechanical Properties and Barrier Character
| Autor: | María José Fabra, M. A. Pèlach, Helena Oliver-Ortega, L.A. Granda, José A. Méndez, Jose M. Lagaron, Quim Tarrés |
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| Přispěvatelé: | Ministerio de Economía y Competitividad (España), Universitat Politècnica de Catalunya. Departament de Ciència i Enginyeria de Materials |
| Rok vydání: | 2020 |
| Předmět: |
Biopolímers
Materials science Thermoplastic Polymers and Plastics Starch barrier properties Composite number Fibres de cel·lulosa Nanocompòsits (Materials) -- Biodegradació Nanocomposites (Materials) -- Biodegradation Enginyeria dels materials [Àrees temàtiques de la UPC] Dispersant Article lcsh:QD241-441 chemistry.chemical_compound Aliments -- Embalatge -- Materials Biopolymers lcsh:Organic chemistry Nanofibrillated cellulose Ultimate tensile strength Cellulose Composite material chemistry.chemical_classification Barrier properties Midó starch Food -- Packing -- Materials Fibres naturals Plasticizer biodegradable nanocomposites food and beverages General Chemistry Plàstics reforçats amb fibra chemistry Biodegradable nanocomposites Cellulose fibers Fiber-reinforced plastics nanofibrillated cellulose Dispersion (chemistry) |
| Zdroj: | Polymers, 2020, vol. 12, núm. 5, p. 1071 Articles publicats (D-EQATA) DUGiDocs – Universitat de Girona instname Polymers Volume 12 Issue 5 Digital.CSIC. Repositorio Institucional del CSIC Polymers, Vol 12, Iss 1071, p 1071 (2020) |
| Popis: | © 2020 by the authors. 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. |
| Databáze: | OpenAIRE |
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