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Improved barrier films of cross-linked cellulose nanofibrils: a microscopy study
KTH, School of Chemical Science and Engineering (CHE), Fibre and Polymer Technology, Fibre Technology. KTH, School of Engineering Sciences (SCI), Centres, VinnExcellence Center BiMaC Innovation.ORCID iD: 0000-0002-7410-0333
KTH, School of Chemical Science and Engineering (CHE), Fibre and Polymer Technology.ORCID iD: 0000-0002-5444-7276
KTH, School of Chemical Science and Engineering (CHE), Fibre and Polymer Technology.ORCID iD: 0000-0001-8622-0386
2014 (English)In: Green materials, ISSN 2049-1220, Vol. 2, no 4, 163-168 p.Article in journal (Refereed) Published
Abstract [en]

It is highly desirable to replace gas barriers of aluminium and non-renewable plastics in order to lower our ecological footprint. One interesting candidate is films made from cellulose nanofibrils (CNFs), which after cross-linking have been shown to have competitive barrier properties even at a high relative humidity (80% RH). This work presents studies at even higher relative humidity (90% RH) and microscopic studies of what happens when unmodified and cross-linked CNF films are exposed to water. The microscopy techniques used were scanning electron microscopy of dry and wet cross-sections of films after freeze-drying and atomic force microscopy in the dry state and in the wet state shortly after wetting. Both techniques clearly revealed that the cross-links prevent the CNFs from separating from each other and hence prevent the films from swelling, so that the free-volume-sensitive gas permeability is maintained at a low level.

Place, publisher, year, edition, pages
2014. Vol. 2, no 4, 163-168 p.
National Category
Paper, Pulp and Fiber Technology
Identifiers
URN: urn:nbn:se:kth:diva-168001DOI: 10.1680/gmat.14.00018OAI: oai:DiVA.org:kth-168001DiVA: diva2:813806
Note

QC 20150615

Available from: 2015-05-25 Created: 2015-05-25 Last updated: 2015-06-15Bibliographically approved

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Publisher's full texthttp://www.icevirtuallibrary.com/content/article/10.1680/gmat.14.00018

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Larsson, Per A.Pettersson, TorbjörnWågberg, Lars

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