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    Cellulose carbamate derived cellulose thin films: preparation, characterization and blending with cellulose xanthate

    Year: 2019

    Journal: Cellulose, Volume 26, AUG, page 7399–7410

    Authors: Weissl, Michael; Hobisch, Mathias Andreas; Johansson, Leena Sisko; Hettrich, Kay; Kontturi, Eero; Volkert, Bert; Spirk, Stefan

    Keywords: Cellulose carbamate; Cellulose xanthate; All cellulose blend films; Cellulose thin film; Cellulose swelling

    Cellulose carbamate (CC) was employed as a water-soluble precursor in the manufacturing of cellulose based thin films using the spin coating technique. An intriguing observation was that during spin coating of CC from alkaline aqueous solutions, regeneration to cellulose was accomplished without the addition of any further chemicals. After rinsing, homogeneous thin films with tunable layer thickness in a range between 20 and 80nm were obtained. Further, CC was blended with cellulose xanthate in different ratios (3:1, 1:1, 1:3) and after regeneration the properties of the resulting all-cellulose blend thin films were investigated. We could observe some slight indications of phase separation by means of atomic force microscopy. The layer thickness of the blend thin films was nearly independent of the ratio of the components, with values between 50 and 60nm for the chosen conditions. The water uptake capability (80-90% relative to the film mass) determined by H2O/D2O exchange in a quartz crystal microbalance wasindependent of the blend ratio.
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