A smart surface prepared using the switchable superhydrophobicity of neat electrospun intrinsically electroactive polyimide fiber mats

Abstract

An electroactive polyimide fiber (EPF) mat based on conjugated segments of electroactive aminocapped aniline trimer (ACAT) as a diamine and 4,4 0 -(4,4 0 -sopropylidenediphenoxy)-bis(phthalic anhydride) (BSAA) as a dianhydride was successfully prepared by electro-spin technology with electrochemical activity and dopable properties, which were similar to polyaniline. The degree of electrochemical activity and dopable properties can be tuned by varying the content of ACAT existing in the as-prepared electro-spun EPF mats. After doping with perfluorooctanesulfonic acid (PFOS), the water contact angle of EPF surface is increased from hydrophobicity at 133 to superhydrophobicity at 155 . It is interesting that the EPF mat undergoes a switchable process from superhydrophobicity to superhydrophilicity via doping with PFOS and de-doping with ammonium gas.

Facile preparation and cell imaging applications of fluorescent organic nanoparticles that combine AIE dye and ring-opening polymerization

“…To prepare RO-OA FONs, the hydrophobic AIE dye (PhNH 2 ) was one-step copolymerized with 4,4 0 -oxydiphthalic anhydride via room temperature anhydride ring-opening polymerization under an air atmosphere (Scheme 1), 49 based on the feed molar ratio, the designed degree of polymerization for copolymers RO-OA was 10. The number average molecular weights (M n ) of the copolymers were determined by gel permeation chromatography (GPC).…”

Superhydrophobic behavior of polyimide–siloxane mats produced by electrospinning

“…However, the various studies demonstrated that the formation of beaded morphology changes surface wetting behavior of material and leads to increased water contact angle [17]. Cengiz et al prepared beaded nanofibers by electrospinning of the terpolymer containing various fluorinated acrylates which have very high water contact angles similar to hierarchical lotus-like appearance [18]. Work by Rutledge and coworkers showed that hydrophobicity increased monotonically with a reduction in diameter for bead-free fibers and with the introduction of a high density of relatively small diameter beads [1].…”

A Novel Application of Electroactive Polyimide Doped with Gold Nanoparticles: As a Chemiresistor Sensor for Hydrogen Sulfide Gas

“…Based on its redox properties, EPI was used as a recognition element in the fabrication of electrochemical sensors [52][53][54][55] and as an anticorrosion material [56][57][58][59][60][61][62][63][64]. Based on its doping and dedoping capability, EPI was also explored as a gas separation membrane [65], and as a smart material characterized for its switchable superhydrophobicity [66]. There have also been papers that investigated means to improve EPI's mechanical strength [67,68] and thermal properties [69].…”