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Cellulose nanofibrils improve the properties of all-cellulose composites by the nano-reinforcement mechanism and nanofibril-induced crystallization
KTH, School of Chemical Science and Engineering (CHE), Fibre and Polymer Technology, Biocomposites.ORCID iD: 0000-0001-5818-2378
2015 (English)In: Nanoscale, ISSN 2040-3364, E-ISSN 2040-3372, Vol. 7, no 42, 17957-17963 p.Article in journal (Refereed) Published
Abstract [en]

All-cellulose nanocomposite films containing crystalline TEMPO-oxidized cellulose nanofibrils (TOCNs) of 0-1 wt% were fabricated by mixing aqueous TOCN dispersions with alkali/urea/cellulose (AUC) solutions at room temperature. The mixtures were cast on glass plates, soaked in an acid solution, and the regenerated gel-like films were washed with water and then dried. The TOCN did not form agglomerates in the composites, and had the structure of TOCN-COOH, forming hydrogen bonds with the hydroxyl groups of the regenerated cellulose molecules. X-ray diffraction analysis revealed that the matrix cellulose molecules increased the cellulose II crystal size upon incorporation of TOCN. As a result, the TOCN/AUC composite films had high Young's modulus, tensile strength, thermal stability and oxygen-barrier properties. The TOCN/AUC composite films are promising all-cellulose nanocomposites for versatile applications as new bio-based materials.

Place, publisher, year, edition, pages
2015. Vol. 7, no 42, 17957-17963 p.
National Category
Polymer Technologies
Identifiers
URN: urn:nbn:se:kth:diva-177435DOI: 10.1039/c5nr05511cISI: 000363650700043PubMedID: 26465589Scopus ID: 2-s2.0-84945271982OAI: oai:DiVA.org:kth-177435DiVA: diva2:872859
Note

QC 20151120

Available from: 2015-11-20 Created: 2015-11-20 Last updated: 2017-12-01Bibliographically approved

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Berglund, Lars A.

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