Hydrophilic–oleophobic coatings on cellulosic materials by plasma assisted polymerization in liquid phase and fluorosurfactant complexation
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Materials with hydrophilic–oleophobic properties are of relevance due to their application to different fields such as self-cleaning coatings, liquid–liquid separation membranes and functional textiles for different technical applications. In this work, hydrophilic–oleophobic coatings have been deposited on cellulosic materials (filter paper and bleached cotton) by means of plasma assisted polymerization of acrylic acid solutions in water followed by cationic fluorosurfactant complexation. Chemical composition of the coatings on cellulosic materials was characterized by means of FTIR–ATR and XPS whereas their morphology was studied by SEM. Hydrophilic–oleophobic behavior was characterized by means of contact angle and wetting time. Additionally wetting properties of cationic, anionic and non-ionic surfactant solutions on the hydrophilic–oleophobic coatings were used to characterize the polyelectrolyte electrostatic forces upon the functionalized layer.
KeywordsHydrophilic–hydrophobic coating Plasma polymerization in liquid Cotton Cellulose Acrylic acid Fluorosurfactant complexation
The work was supported by a grant from the CSIC/RGC Joint Research Scheme sponsored by the Research Grants Council of Hong Kong and the Spanish National Research Council (Reference No. S-HK007/12). We are grateful to Chemguard for the generous gift of fluorosurfactant solutions. The authors would also like to thank J. Fortuño (Electron Microscopy Service, ICM/CSIC, Barcelona, Spain) for his valuable help in SEM analysis.