title: Durable and Hydrophobic Organic-Inorganic Hybrid Coatings via Fluoride Rearrangement of Phenyl T12Silsesquioxane and Siloxanes.
abstract: There have been many successful efforts to enhance the water shedding properties of hydrophobic and superhydrophobic coatings, but durability is often a secondary concern. Here, we describe durable and hydrophobic coatings prepared via fluoride catalyzed rearrangement reaction of dodecaphenylsilsesquioxane [PhSiO1.5]12(DDPS) with octamethylcyclotetrasiloxane (D4). Hydrophobic properties and wear resistance are maximized by incorporating both low surface energy moieties and cross-linkable moieties into the siloxane network. Water contact angles as high as 150 ± 4° were achieved even after 150 wear cycles with SiC sandpaper (2000 grit, 2 kPa). These hybrid organic-inorganic copolymers also have high thermal stabilities after curing at 250 °C (Td5%≥ 340 °C in air) due to the siloxane network with a maximum Td5%of >460 °C measured for the system with the highest silsesquioxane content. The coating systems presented here offer a unique combination of hydrophobicity and mechanical/thermal stability and could greatly expand the utility of water repellent coatings.
authors.affiliation: Macromolecular Science and Engineering, University of Michigan , Ann Arbor, Michigan 48109, United States.|Continental Structural Plastics , Auburn Hills, Michigan 48326, United States.
authors.forename: David J
authors.identifier: http://orcid.org/0000-0003-1584-7872
authors.initials: DJ
authors.lastname: Krug
authors.affiliation: Macromolecular Science and Engineering, University of Michigan , Ann Arbor, Michigan 48109, United States.|Materials Science and Engineering, University of Michigan , Ann Arbor, Michigan 48109, United States.
authors.forename: Richard M
authors.identifier: http://orcid.org/0000-0003-4939-3514
authors.initials: RM
authors.lastname: Laine
keywords: hydrophobic; multifunctional coatings; silsesquioxane; thermal stability; thin film; wear resistant