Bi-functional random copolymers for one-pot fabrication of superamphiphobic particulate coatings

Abstract

Random bi-functional copolymers bearing fluorinated units and sol-gel forming units were prepared and used together with silica particles in a one-pot process for preparing superamphiphobic coatings. The copolymers P(FOEA-r-IPSMA) were prepared by atom transfer radical polymerization (ATRP) of 2-(perfluorooctyl)ethyl acrylate (FOEA) and 3-(triisopropyloxy)silylpropyl methacrylate (IPSMA). The uniform silica particles were prepared using a modified Stöber process. Stirring P(FOEA-r-IPSMA), silica, water, and HCl together with substrates triggered the sol-gel reactions of the IPSMA units. These involved first the hydrolysis of IPSMA to yield silanol groups and then the condensation of the IPSMA silanol groups among themselves, and with silanol groups on silica or glass surfaces or with hydroxyl groups on cotton or filter paper. At optimized mass ratios of P(FOEA-r-IPSMA) to silica, the resultant coatings consisted of lightly covered silica particles that were embedded in a crosslinked P(FOEA-r-IPSMA) film. By optimizing the molar ratio between FOEA and IPSMA in P(FOEA-r-IPSMA), the rough particulate coatings on cotton, filter paper, and glass plates exhibited superamphiphobicity. More importantly, the particulate coatings were resistant to solvent extraction and NaOH etching.

Recent Development in Durable Super‐Liquid‐Repellent Fabrics

“…Polymers that bring silanol and low‐surface‐energy block were used to form a durable liquid repellent coating on cotton . For example, poly‐(3‐(triisopropyloxysilyl) propyl methacrylate)‐ block ‐poly((2‐(perfluorooctyl)ethyl methacrylate) (PIPSMA‐ b ‐PFOEMA) can hydrolyze to yield silanol groups.…”

Super-robust superamphiphobic surface with anti-icing property

“…9 The preparation of superamphophobic surfaces presents a greater challenge since lipophilic liquids such as cooking oils have a lower surface tension compared to that for water. [10][11][12] Meanwhile, textured surface required for superamphiphobic surface exhibits roughness on both the nanometer and the micrometer scales. 13,14 So far, many methods have been developed to meet this demand for hierarchical roughness in the quest for superamphiphobic surface.…”

Fabricating durable, fluoride‐free, water repellency cotton fabrics with CPDMS

“…Generally speaking, both surface physical coating and chemical modifications incorporate hydrophobic functions on cotton fabrics while retaining their air permeability . The chemical finishing of the fabrics is especially beneficial for achieving robust water repellence, durability, and air permeability, and widely applied in treatments of cotton fabrics . The current chemical finishes mainly involve the use of fluorinated compounds, which react with cellulose to obtain durable hydrophobic performance .…”