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Effect of clay type on dispersion and barrier properties of hydrophobically modified poly(vinyl alcohol)-bentonite nanocomposites
Karlstad University, Faculty of Health, Science and Technology (starting 2013), Department of Engineering and Chemical Sciences.ORCID iD: 0000-0001-7368-7227
Materials and Engineering Research Institute, Sheffield Hallam University, Sheffield, United Kingdom.
2015 (English)In: Journal of Applied Polymer Science, ISSN 0021-8995, E-ISSN 1097-4628, Vol. 132, no 28, article id 42229Article in journal (Refereed) Published
Abstract [en]

The oxygen and water vapor permeability at high relative humidity was studied for composite films formed by incorporation of three different bentonites (MMT) into an ethylene-modified, water-soluble poly(vinyl alcohol), EPVOH. The oxygen permeability decreased linearly with an increased addition of hydrophilic MMTs. X-ray diffraction and Fourier transform infrared spectroscopy suggested a homogeneous distribution in the thickness direction with disordered and probably exfoliated structures for hydrophilic MMTs. In contrast, organophilic modified clay showed an intercalated structure with the clay preferentially located at the lower film surface, a combination which was however efficient in reducing the water vapor- and oxygen permeabilities at low addition levels. Composite films of EPVOH and Na+-exchanged MMT resulted in high resistance to dissolution in water, which was ascribed to strong interactions between the components resulting from matching polarities. Annealing the films at 120 degrees C resulted in enhanced resistance to water dissolution and a further reduction in oxygen permeability.

Place, publisher, year, edition, pages
John Wiley & Sons, 2015. Vol. 132, no 28, article id 42229
Keywords [en]
clay, composites, films, packaging, surfaces and interfaces
National Category
Polymer Technologies
Research subject
Chemical Engineering
Identifiers
URN: urn:nbn:se:kau:diva-37296DOI: 10.1002/app.42229ISI: 000353964000010OAI: oai:DiVA.org:kau-37296DiVA, id: diva2:844561
Available from: 2015-08-06 Created: 2015-08-06 Last updated: 2017-12-04Bibliographically approved

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Johansson, Caisa

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