Low-Birefringent and Highly Tough Nanocellulose-Reinforced Cellulose Triacetate
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
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.
nanocellulose, cellulose triacetate, TEMPO, birefringence, nanocomposite
Other Engineering and Technologies
IdentifiersURN: urn:nbn:se:kth:diva-169965DOI: 10.1021/acsami.5b02863ISI: 000355382800050PubMedID: 25946413ScopusID: 2-s2.0-84930651993OAI: oai:DiVA.org:kth-169965DiVA: diva2:826531
QC 201506252015-06-252015-06-252015-06-25Bibliographically approved