Increase in water resistance of paperboard by coating with poly(lactide)
Article first published online: 24 JAN 2007
Copyright © 2007 John Wiley & Sons, Ltd.
Packaging Technology and Science
Volume 20, Issue 6, pages 393–402, November/December 2007
How to Cite
Rhim, J.-W., Lee, J.-H. and Hong, S.-I. (2007), Increase in water resistance of paperboard by coating with poly(lactide). Packag. Technol. Sci., 20: 393–402. doi: 10.1002/pts.767
- Issue published online: 29 NOV 2007
- Article first published online: 24 JAN 2007
- Manuscript Accepted: 1 DEC 2006
- Manuscript Revised: 30 NOV 2006
- Manuscript Received: 24 JUL 2006
- water resistance;
Poly(lactide) (PLA)-coated paperboards (PB) were prepared, and the effect of coating for improving water resistance of paperboard used for corrugated box liners was tested. Surface of paperboards became smoother through PLA coating, and their thickness and weight of coating increased depending on the concentration of the coating solution. Tensile strength of paperboard decreased, while elongation at break (E) increased after PLA coating. All water barrier properties tested, such as water vapour permeability (WVP), water absorptiveness (WA) and contact angle (CA) of water drop, indicated that water resistance of paperboard was improved through surface coating with PLA. WVP decreased from 4.8 to 25.5 times, and WA decreased from 11.9 to 17.9 times depending on the PLA concentration. The increase in water resistance of PLA-coated paperboards was due to the hydrophobicity of PLA, which was proven through CA measurement. CA determined by both static and dynamic methods demonstrated the increase in initial CA of PLA-coated paperboards, indicating an increased hydrophobicity of surface. All test results indicated that the optimum concentration of coating solution for improving water resistance of paperboard was 3 w/v % of PLA soulution. Copyright © 2007 John Wiley & Sons, Ltd.