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

Content Provider	Springer Nature Link
Author	Yang, Quanling Saito, Tsuguyuki Isogai, Akira
Copyright Year	2012
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.
Starting Page	1913
Ending Page	1921
Page Count	9
File Format	PDF
ISSN	09690239
Journal	Cellulose
Volume Number	19
Issue Number	6
e-ISSN	1572882X
Language	English
Publisher	Springer Netherlands
Publisher Date	2012-09-21
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Regenerated cellulose AKD Water repellency Oxygen barrier Alkali/urea solution Bioorganic Chemistry Physical Chemistry Polymer Sciences Organic Chemistry
Content Type	Text
Resource Type	Article
Subject	Polymers and Plastics

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