Durable and Hydrophobic Organic–Inorganic Hybrid Coatings via Fluoride Rearrangement of Phenyl T₁₂ Silsesquioxane 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 [PhSiO] (DDPS) with octamethylcyclotetrasiloxane (D). 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 (T ≥ 340 °C in air) due to the siloxane network with a maximum T 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.

Introduction of Boron Functionalities into Silsesquioxanes: Novel Independent Methodologies

“…and toluene (0.5 mL). The reaction mixture was stirred at room temperature for 1h (1 and 3)o r2h ( 5). After this time, the excess amounts of toluene and hydroborane were removed under reduced pressure to give corresponding products 1, 3,and 5.…”

“…[1][2][3][4][5][6][7][8] In this connection, they have been extensively investigated, especially in materialc hemistry. [1][2][3][4][5][6][7][8] In this connection, they have been extensively investigated, especially in materialc hemistry.…”

“…Due to their unique properties such as aw ell-definedh ighly symmetric nanostructure and thermal stability, POSS molecules (POSS = polyhedralo ligomeric silsesquioxane)h ave been widely used as versatile buildingb locks for the construction of hybrid materials. [1][2][3][4][5][6][7][8] In this connection, they have been extensively investigated, especially in materialc hemistry. [9][10][11][12] Recently,t he synthesis of functionalizeds ilsesquioxanes cages( SQs) containing other heteroatomsa nd functional groupsh as been strongly developed by many scientists.…”

Silsesquioxane‐Containing Hybrid Nanomaterials: Fascinating Platforms for Advanced Applications

“…Hybrid nanomaterials usually have a large surface‐to‐volume ratio allowing more reactions to occur on the surface. In addition, hybrid nanomaterials are easy to synthesize and modify chemically, which can provide versatile platforms for many applications …”

“…In addition, hybrid nanomaterials are easy to synthesize and modify chemically, which can provide versatile platforms for many applications. [2,3] Silsesquioxanes (SSQs) are a family of organic-inorganic hybrid nanomaterials obtained from the hydrolysis and polycondensation of trialkoxysilane or trichlorosilane monomers containing organic groups. [4,5] SSQs can have a range of properties, such as high chemical and thermal resistance, biocompatibility, and luminescence, depending on the type of precursor used…”