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Improved barrier films of cross-linked cellulose nanofibrils: a microscopy study
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- Larsson, Per A., 1980- (author)
- KTH,Fiberteknologi,VinnExcellens Centrum BiMaC Innovation
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- Pettersson, Torbjörn (author)
- KTH,Fiber- och polymerteknologi
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- Wågberg, Lars (author)
- KTH,Fiber- och polymerteknologi
- (creator_code:org_t)
- Thomas Telford Ltd. 2014
- 2014
- English.
- In: Green materials. - : Thomas Telford Ltd.. - 2049-1220 .- 2049-1239. ; 2:4, s. 163-168
- Journal article (peer-reviewed)
Abstract
Subject headings
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- 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.
Subject headings
- TEKNIK OCH TEKNOLOGIER -- Materialteknik -- Pappers-, massa- och fiberteknik (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Materials Engineering -- Paper, Pulp and Fiber Technology (hsv//eng)
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- art (subject category)
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