Superamphiphobic Diblock Copolymer Coatings

Abstract

A new diblock copolymer, poly [3-(triisopropyloxysilyl)propyl methacrylate]-block-poly [2-(perfluorooctyl)ethyl methacrylate] (P1 or PIPS-MA-b-PFOEMA), that bore a fluorinated PFOEMA block and a solÀgel forming PIPSMA block was synthesized by sequential anionic polymerization and was characterized. P1 was then used to coat silica particles. Factors affecting the amount of P1 grafted onto the silica particles by the solÀgel reactions of the PIPSMA block were investigated, and the coating conditions were optimized. At sufficiently high P1-to-silica mass feed ratios, P1 chemically grafted onto silica surfaces to yield a monolayer. While monolayer formation was supported by results of thermogravimetric analyses, dynamic light scattering, atomic force microscopy, and transmission electron microscopy, our X-ray photoelectron spectroscopy study suggested that the monolayer was topped by the PFOEMA block. Depositing these particles onto microscope slides and printing paper yielded rugged silica films. These films were superamphiphobic, and both water and oil droplets (cooking oil, diodomethane, and hexadecane) possessed large contact angles. The films composed of P1-coated silica particles had substantial resistance to etching by aqueous NaOH solution.

Superamphiphobic surfaces

“…11) and their superamphiphobicity can maintain for a long time. 61 paper, 62 gel, 51,52 and so on, protecting their surfaces from being wetted, contaminated or fouled by water and oily pollutant. Besides, the surface superamphiphobic modification brings about not only super-antiwetting function but also other derived functions such 45 as self-cleaning, anti-fogging, anti-bacteria, corrosion resistance, and oil transportation, which will be discussed in the following sections.…”

Recent developments in polymeric superoleophobic surfaces

“…66 nanoparticles are the most common inorganic materials. There are three typical approaches: (1) the nanoparticles are first blended with the fluoropolymer, then the solution is coated onto the substrates; 83,85,91,93 (2) the nanoparticles are first modified with low surface energy compounds, then the modified particles are coated on the substrates; 84,88,92 (3) the nanoparticles are first stacked on the substrates, then coated with fluoropolymers. 66,86,87 Schutzius et al followed the first approach, and made dispersions by combining fluoropolymer blends with clay nanoparticles or carbon nanowhiskers.…”

“…118 Super Oil-Repellent Coatings The broadest application for superoleophobic surfaces is constructing super oil-repellent coatings for textiles, 46,82,89,90,105,106,[119][120][121][122] woods, 107 metal, 53,104,123 and other substrates. 83,88 Oil-repellent coatings can keep substrates from fouling or corrosion by oils and other liquids, and thus show great significance. Fluoropolymers are the most commonly used materials because of their flexibility, diversiform molecular design, good processability, and low cost.…”

Mechanical Properties of Highly Porous Super Liquid‐Repellent Surfaces

“…They partially assemble into agglomerates which are connected by strings of particles. The fragile network was stabilized by deposition of a silica shell using chemical vapor deposition (CVD) of tetraethyl orthosilicate (TEOS) for 24,48, and 72 h. These samples are referred to as coated soot. The thickness of the deposited silica layer increased with CVD time and ranged from 20-35, 35-71, and 60-100 nm for 24,48, and 72 h, respectively.…”