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Superhydrophobic and breathable resorcinol-formaldehyde Xerogels

AutorDíaz Alonso-Buenaposada, Isabel ; Arenillas de la Puente, Ana ; Montes Morán, Miguel Ángel ; Menéndez Díaz, José Ángel
Palabras claveXerogels
Hydrophobicity
Surface chemistry
Passivation
Fecha de publicación2-jun-2017
EditorElsevier
CitaciónJournal of Non-Crystalline Solids 471: 202-208 (2017)
ResumenA new macroporous, waterproof and breathable material has been synthetized. The synthesis of these materials consists in a modified version of the classical resorcinol-formaldehyde (RF) xerogels synthesis. This new process includes a further treatment, after the gelation-curing-drying process, with methanol at 240 °C in order to passivate the hydrophilic phenolic groups of the surface of the RF xerogel. It was found that the treatment time strongly depends on the pore size of the xerogels. After reaching a threshold time, the hydrophilic materials become superhydrophobic. It is postulated that the exohedral inner surface of the porous xerogels, different from most porous materials, is responsible for this behavior. Although the materials exhibit a superhydrophobic behavior against liquid water and maintain its waterproofness for a long period of time, they are able to adsorb/desorb water vapor, which makes them also breathable.
Versión del editorhttps://doi.org/10.1016/j.jnoncrysol.2017.05.039
URIhttp://hdl.handle.net/10261/156371
DOI10.1016/j.jnoncrysol.2017.05.039
ISSN0022-3093
E-ISSN1873-4812
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