Cellulose

, Volume 19, Issue 3, pp 695–703 | Cite as

Improvement of mechanical and oxygen barrier properties of cellulose films by controlling drying conditions of regenerated cellulose hydrogels

  • Quanling Yang
  • Shuji Fujisawa
  • Tsuguyuki Saito
  • Akira Isogai
Original Paper

Abstract

Mechanical, thermal and oxygen barrier properties of regenerated cellulose films prepared from aqueous cellulose/alkali/urea solutions can be markedly improved by controlling the drying conditions of the films. By pre-pressing followed by vacuum drying under compression, the tensile strength, Young’s modulus, coefficient of thermal expansion and oxygen permeability of the dried films reached 263 MPa, 7.3 GPa, 10.3 ppm K−1 and 0.0007 ml μm m−2 day−1 kPa−1, respectively. Thus, films produced in this way show the highest performance of regenerated cellulose films with no orientation of cellulose chains reported to date. These improved properties are accompanied by a clear increase in cellulose II crystallinity from 50 to 62% during pre-pressing/press-vacuum drying process. At the same time, the film density increased from 1.45 to 1.57 g cm−3, and the moisture content under equilibrium conditions decreased from 14.1 to 9.8%. Hence, the aqueous alkali/urea solvent system has potential applications in producing new and environmentally friendly cellulose films with high performances through control of the drying conditions.

Keywords

Regenerated cellulose film Alkali/urea Drying conditions Oxygen barrier Mechanical properties 

Notes

Acknowledgments

This study was partially supported by the Japan Society for the Promotion of Science (JSPS), Grant-in-Aid for Scientific Research S (grant number 21228007), and by the China Scholarship Council (CSC) for QY.

Supplementary material

10570_2012_9683_MOESM1_ESM.doc (167 kb)
Supplementary material 1 (DOC 167 kb)

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Copyright information

© Springer Science+Business Media B.V. 2012

Authors and Affiliations

  • Quanling Yang
    • 1
  • Shuji Fujisawa
    • 1
  • Tsuguyuki Saito
    • 1
  • Akira Isogai
    • 1
  1. 1.Graduate School of Agricultural and Life SciencesThe University of TokyoBunkyo-ku, TokyoJapan

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