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A waterproof cellulose nanofibril sheet prepared by the deposition of an alkyl ketene dimer on a controlled porous structure |
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| Authors: | Oh Yujin Park Shin Young Yook Simyub Shin Heenae Lee Hak Lae Youn Hye Jung |
| Institution: | 1.Department of Agriculture, Forestry and Bioresources, College of Agriculture and Life Sciences, Seoul National University, 08826, Seoul, Korea ;2.National Institute of Forest Science, 02455, Seoul, Korea ;3.Research Institute of Agriculture and Life Sciences, Seoul National University, 08826, Seoul, Korea ;4.State Key Laboratory of Biobased Material and Green Papermaking, Qilu University of Technology, Shandong Academy of Sciences, 250353, Jinan, Shandong Province, China ; |
| Abstract: | This study prepared a waterproof cellulose nanofibril (CNF) sheet via the deposition of an alkyl ketene dimer (AKD) on the sheet’s controlled porous structure. The porosity of the CNF sheet was controlled by drying under different conditions, which included hot-press drying (HD) and solvent-exchange drying (SD), and the effect on the hydrophobization and water-related barrier performance of the sheet were investigated. When the SD sheet was immersed in an AKD wax solution, the sheet exhibited super-hydrophobicity and a lower water vapor transmission rate, compared with the HD sheet. This indicated that the porous structure of the SD sheet enabled AKD to be adsorbed on both the surface and the inner surface and it filled in the pores of the sheet, thereby giving rise to excellent waterproofing properties. The performance of a hydrophobized SD sheet as a water barrier material was comparable to a linear low-density polyethylene film. This study confirms the possibility for AKD wax to be immersed in a porous CNF sheet and used as a potential barrier material in hydrogel packaging. Graphical abstract |
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