Cellulose

, Volume 19, Issue 6, pp 1913–1921

Facile fabrication of transparent cellulose films with high water repellency and gas barrier properties

Original Paper

DOI: 10.1007/s10570-012-9790-5

Cite this article as:
Yang, Q., Saito, T. & Isogai, A. Cellulose (2012) 19: 1913. doi:10.1007/s10570-012-9790-5

Abstract

Transparent and water repellent gas barrier cellulose films were fabricated by surface modification of alkali/urea regenerated cellulose (AUC) films by soaking in cationic alkylketene dimer (AKD) dispersion, drying, and heating. Highly water repellent and excellent gas barrier properties were obtained for AKD-treated and heated AUC films due to covering of the film surfaces by hydrophobic AKD components. The maximum AKD content of the films was 0.2 %. Oxygen transmission rates for AKD-treated AUC films at 0 % relative humidity (RH) were less than 0.0005 mL m−2 day−1 kPa−1, the lowest detection limit of the instrument. Water contact angles on the AUC film increased from 50 to 110° after AKD treatment, and water uptake (immersion in water for 6 days) decreased from 92 to 20 %. Moreover, oxygen permeability decreased from 0.56 and 5.8 to 0.13 and 2.1 mL μm m−2 day−1 kPa−1 at 50 and 75 % RH, respectively, when the AKD content of the film was increased from 0 to 0.2 %. The present AKD-treated AUC film also had high light transparency (88 % at 600 nm), tensile strength (168 MPa), elongation at break (29 %), and work of fracture (37 MJ m−3). FT–IR analysis showed that AKD components were still present as major species on the AKD-treated film surfaces without hydrolysis at 2 months after conditioning the films at 23 °C and 50 % RH, indicating that such AKD molecules contributed to the hydrophobic nature of the AKD-treated AUC films.

Keywords

Regenerated cellulose AKD Water repellency Oxygen barrier Alkali/urea solution 

Supplementary material

10570_2012_9790_MOESM1_ESM.doc (1.6 mb)
Supplementary material 1 (DOC 1600 kb)

Copyright information

© Springer Science+Business Media Dordrecht 2012

Authors and Affiliations

  1. 1.Graduate School of Agricultural and Life SciencesThe University of TokyoBunkyo-ku, TokyoJapan

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