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Bleached and unbleached MFC nanobarriers: properties and hydrophobisation with hexamethyldisilazane

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Abstract

This study explores the production and surface modification of microfibrillated cellulose (MFC), based on unbleached and bleached Pinus radiata pulp fibres. Unbleached Pinus radiata pulp fibres tend to fibrillate easier by homogenisation without pre-treatment, compared to the corresponding bleached MFC. The resulting unbleached MFC films have higher barrier against oxygen, lower water wettability and higher tensile strength than the corresponding bleached MFC qualities. In addition, it is demonstrated that carboxymethylation can also be applied for production of highly fibrillated unbleached MFC. The nanofibril size distribution of the carboxymethylated MFC is narrow with diameters less than 20 nm, as quantified on high-resolution field-emission scanning electron microscopy images. The carboxymetylation had a larger fibrillation effect on the bleached pulp fibres than on the unbleached one. Importantly, the suitability of hexamethyldisilazane (HMDS) as a new alternative for rendering MFC films hydrophobic was demonstrated. The HMDS-modified films made of carboxymethylated MFC had oxygen permeability levels better than 0.06 mL mm m−2 day−1 atm−1, which is a good property for some packaging applications.

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Authors and Affiliations

  1. Paper and Fibre Research Institute (PFI), Høgskoleringen 6b, NO-7491, Trondheim, Norway

    Gary Chinga-Carrasco, Ingebjørg Leirset & Kristin Syverud

  2. Kazan National Research Technological University (KNRTU), Karl Marks 68, 420015, Kazan, Russia

    Nina Kuznetsova, Milyausha Garaeva, Guzaliya Galiullina & Anatoly Kostochko

Authors
  1. Gary Chinga-Carrasco
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  2. Nina Kuznetsova
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  3. Milyausha Garaeva
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  4. Ingebjørg Leirset
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  5. Guzaliya Galiullina
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  6. Anatoly Kostochko
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  7. Kristin Syverud
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Correspondence to Gary Chinga-Carrasco.

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Chinga-Carrasco, G., Kuznetsova, N., Garaeva, M. et al. Bleached and unbleached MFC nanobarriers: properties and hydrophobisation with hexamethyldisilazane. J Nanopart Res 14, 1280 (2012). https://doi.org/10.1007/s11051-012-1280-z

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  • DOI: https://doi.org/10.1007/s11051-012-1280-z

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