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Nonfluorinated Superhydrophobic Chemical Coatings on Polyester Fabric Prepared with Kinetically Controlled Hydrolyzed Methyltrimethoxysilane
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posted on 2019-08-07, 14:36 authored by Haisheng Lin, Cornelia Rosu, Lu Jiang, Vikram A. Sundar, Victor Breedveld, Dennis W. HessNonfluorinated
chemical coatings to generate durable water repellency
have become increasingly important as a method of improving materials
and product performance. Here we report a kinetically controlled fabrication
of superhydrophobic polyester fabrics via one-step dip-coating in
water-based solutions of fluorine-free hydrolyzed methyltrimethoxysilane
(MTMS). The hydrophobicity of coated fabrics was tuned by varying
the morphologies of surface-coated silica layers from smooth thin
film to hierarchical structures. This was achieved by systematically
altering MTMS solution pH and reaction time to control the reaction
kinetics of hydrolysis and polymerization. These results offer a new
strategy and approach toward fabrication of superhydrophobic coatings
with tunable hierarchy. The mechanism of MTMS reaction with NH4OH catalyst was investigated with FTIR and multiangle dynamic
light scattering (MADLS) for improved coating performance. The stability
and durability of MTMS coatings were carefully verified after washing
and accelerated weathering tests through contact angle, spray test,
and XPS analysis. Impact contact angle (ICA) was invoked to quickly
assess liquid droplet adhesion after surface impact; this test proffers
a viable substitute for the standard AATCC 22–2005 spray test.
The technology presented here can be extended to other organosilanes
with one functional group and three hydrolyzable methoxy substituents
to allow a variety of surface functionalities and open a wide range
of applications in the field of green surface chemistry modifications.
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contact angleNH 4 OH catalystdroplet adhesionMTMS coatingssurface-coated silica layersimpact contact anglereaction timefabricationtest proffersweathering testswater-based solutionsNonfluorinated Superhydrophobic Chemical CoatingsFTIRcoating performancePolyester Fabrichydrolyzable methoxy substituentswater repellencyspray testproduct performancesurface functionalitiesKinetically Controlled Hydrolyzed Methyltrimethoxysilane Nonfluorinated chemical coatingsMTMS solution pHMTMS reactionsurface chemistry modificationsresults offersuperhydrophobic coatingsXPS analysissuperhydrophobic polyester fabricsreaction kineticsICAAATCCMADLStunable hierarchysurface impact
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