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Issue 38, 2016
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Molecular mobility in cellulose and paper

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Abstract

We study the dielectric relaxation in paper of different density and in microcrystalline cellulose in a temperature range between 150 K and 350 K. Qualitatively the spectra display the same relaxations α, β, γ. An additional relaxation, βwet, is found in humidified samples. The adsorption of water is determined and related to the humidity of the surrounding. Two adsorption processes are identified as primary and secondary adsorption at the hydroxyl groups in the amorphous domains of the cellulose. The γ process in the dielectric spectrum is found to be directly related to the amount of water adsorbed in the sample. While qualitatively the differences to unprocessed, microcrystalline cellulose are negligible, quantitatively the less localised β-relaxation shows an increased relaxation strength induced by the geometrical confinement and orientation effects due to the processing into cellulose fibres. While the manufacturing process leads to paper with different density and porosity there is no significant change in water uptake, structure or dynamics.

Graphical abstract: Molecular mobility in cellulose and paper

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Publication details

The article was received on 15 Jan 2016, accepted on 19 Mar 2016 and first published on 31 Mar 2016


Article type: Paper
DOI: 10.1039/C6RA01320A
RSC Adv., 2016,6, 32389-32399
  • Open access: Creative Commons BY-NC license
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    Molecular mobility in cellulose and paper

    B. Kuttich, A. Grefe, H. Kröling, S. Schabel and B. Stühn, RSC Adv., 2016, 6, 32389
    DOI: 10.1039/C6RA01320A

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