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Low-Birefringent and Highly Tough Nanocellulose-Reinforced Cellulose Triacetate
KTH, School of Chemical Science and Engineering (CHE), Fibre and Polymer Technology, Biocomposites.ORCID iD: 0000-0001-5818-2378
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2015 (English)In: ACS Applied Materials and Interfaces, ISSN 1944-8244, E-ISSN 1944-8252, Vol. 7, no 20, 11041-11046 p.Article in journal (Refereed) Published
Abstract [en]

Improvement of the mechanical and thermal properties of cellulose triacetate (CTA) films is required without sacrificing their optical properties. Here, poly(ethylene glycol) (PEG)-grafted cellulose nanofibril/CTA nanocomposite films were fabricated by casting and drying methods. The cellulose nanofibrils were prepared by 2,2,6,6-tetramethylpiperidine-l-oxyl,(TEMPO)-mediated oxidation, and amine-terminated PEG chains were grafted onto the surfaces of the TEMPO-oxidized cellulose nanofibrils (TOCNs) by ionic bonds. Because of the nanosize effect of TOCNs with a uniform width of similar to 3 nm, the PEG-TOCN/CTA nanocomposite films had high transparency and low bitefringence. The grafted PEG chains enhanced the filler-matrix interactions and crystallization of matrix CTA molecules, resulting in the Young's modulus and toughness of CTA film being significantly improved by PEG-grafted TOCN addition. The coefficient of thermal expansion of the original CTA film was mostly preserved even with the addition of PEG-grafted TOCNs. These results suggest that PEG-TOCNs are applicable to the reinforcement for transparent optical films.

Place, publisher, year, edition, pages
2015. Vol. 7, no 20, 11041-11046 p.
Keyword [en]
nanocellulose, cellulose triacetate, TEMPO, birefringence, nanocomposite
National Category
Other Engineering and Technologies
Identifiers
URN: urn:nbn:se:kth:diva-169965DOI: 10.1021/acsami.5b02863ISI: 000355382800050PubMedID: 25946413Scopus ID: 2-s2.0-84930651993OAI: oai:DiVA.org:kth-169965DiVA: diva2:826531
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QC 20150625

Available from: 2015-06-25 Created: 2015-06-25 Last updated: 2017-12-04Bibliographically approved

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Berglund, Lars

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