Structure and gas separation properties of composite films based on polyaniline

Abstract

ABSTRACT:Composite films based on the polyvinyltrimethylsilane (PVTMS) with polyaniline (PANI) coating were obtained by borderline polymerization of aniline. The obtained coating was shown to differ from the polymer forming in the reaction mixture bulk both in chemical structure and morphology. Ratio and concentration of the reagents, mixing rate, reaction time, and condition of support surface were among the investigated factors affecting the growth and quality of PANI coating. The gas separation characteristics of composite membranes, as affected by the process conditions and the type of PANI, were investigated. It is shown that the proposed method provides a means for obtaining composite membranes that combine high selectivity, especially in O 2 /N 2 , He/CH 4 , and CO 2 /CH 4 separation, with permeability higher than that of known composite materials.

On the origin of colloidal particles in the dispersion polymerization of aniline

“…If all the monomer has not been consumed in the formation of a colloid, then the subsequent start of precipitation polymerization begins to produce a precipitate along with the particles. It has indeed been observed that, if the monomer had been consumed in the surface polymerization on a suitable substrate, no polymer precipitate was produced in the aqueous phase [9,13,17,25]. Similarly, if all the monomer had been converted to produce colloidal particles by the polymerization at the stabilizer, there would be no contaminating precipitate.…”

“…Conducting polymer films can also be grown on various surfaces provided by microparticles [16,17], microspheres [18][19][20][21], or larger particles such as wood sawdust [22] and ferrites [23], membranes [24,25], porous and layered materials [26,27], and fibers [9,[28][29][30][31][32]. It has been observed that the introduction of various substrates with a large specific surface area into the reaction mixture accelerates the polymerization of aniline.…”

Polyaniline: Thin films and colloidal dispersions (IUPAC Technical Report)

“…PANI films have been grown on the flat surfaces of glass [16][17][18][19][20], silicon [26,27], various polymers [28,29], and noble metals [30][31][32]. Many other template morphologies have also been tested: carbon nanotubes [33], polymer fibers and textiles [21,34,35], membranes [36,37], polymer microspheres [38,39], natural particulate materials, like wood sawdust [19], and others have been coated with PANI.…”

“…Special attention has been paid to montmorillonite and related clays [45][46][47][48]. The applications of surface-modified substrates range from sensors and electronic noses [18,49], electrodes [30,50], conducting fillers [51], electro-rheological suspensions [42,48,52], corrosion protection [45], gas-separation membranes [29], and catalysis of organic reactions [53] to electromagnetic interference shielding [34] or increasing the dielectric breakdown of polymer films [28].…”

Characterization of polyaniline‐coated stationary phases by using the linear solvation energy relationship in the hydrophilic interaction liquid chromatography mode using capillary liquid chromatography

“…One of its interesting features is that, in addition to a bulk precipitate, it forms a thin film on the surface of the material (e.g. glass [4], another polymer [5,6], carbon nanotubes [7], silicon [8,9], noble metals [9][10][11], or even wood [12]) in direct contact with the polymerization mixture. Consequently, it has been thoroughly investigated as a surface modifier for multiple applications, such as flexible electrodes, conductive fibers, organic field transistors, electrochromic glasses, anticorrosive coatings, biosensors, gas separation membranes, or catalysts [6,[13][14][15][16][17].…”