Fabrics with Tunable Oleophobicity

Advanced Materials (Impact Factor: 15.41). 06/2009; 21(21):2190 - 2195. DOI: 10.1002/adma.200802502
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    ABSTRACT: Two linear triblock terpolymers were synthesized and used to coat cotton textiles. These copolymers consist in sequence of a water-soluble poly(ethylene glycol) (PEG) block, a highly water- and oil-repellant poly[2-(perfluorooctyl)ethyl methacrylate] (PFOEMA) block, and a photo-cross-linkable poly(2-cinnamoyloxyethyl methacrylate) (PCEMA) block. The PEG block bonds to PFOEMA via a redox-cleavable disulfide junction (-S-2-). To prepare the copolymers, monomethoxy PEG (PEG-OH) was derivatized to yield a PEG chain bearing one terminal thiol group (PEG-SH). Atom transfer radical polymerization and deprotection chemistry were used to prepare Py-S-2-PFOEMA-b-PHEMA, where PHEMA and Py-S-2- denote poly(2-hydroxyethyl methacrylate) and a terminal pyridin-2-yldisulfanyl group, respectively. Reacting PEG-SH with Py-S-2-PFOEMA-b-PHEMA via a thiol disulfide exchange reaction yielded PEG-S-2-PFOEMA-b-PHEMA, and the cinnamation of the PHEMA block produced PEG-S-2-PFOEMA-b-PCEMA. PEG-S-2-PFOEMA-b-PCEMA dispersed in water and plasticized by a trace amount of dimethyl phthalate was then used to coat cotton textiles, and this coating was secured by photo-cross-linking the PCEMA domains. Treating the coating with dithiothreitol cleft the disulfide junction and thus the PEG block, revealing the hidden PFOEMA block and its water- and oil-repellant properties. Aqueous solutions of these copolymers could thus be applied onto a substrate to provide amphiphobic coatings.
    Macromolecules 08/2014; 47(15):5115-5123. DOI:10.1021/ma501219h · 5.93 Impact Factor
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    ABSTRACT: We have studied the wetting of thin liquid (perfluoromethylcyclohexane) films on surfaces nano-patterned with hexagonally packed arrays of cylindrical nano-cavities by X-ray scattering methods. The liquid adsorption on the substrate was controlled precisely by varying the chemical potential of the liquid with respect to the value at liquid/vapor coexistence. We have probed the structural evolution of the wetting film inside the cavities and on the planar regions between them. The results are compared with theoretical predictions.
    Soft Matter 01/2013; 9(44):10550. DOI:10.1039/c3sm51188j · 4.15 Impact Factor
  • 07/2014; 6(7):e109. DOI:10.1038/am.2014.34