Conductive polyaniline poly(methyl methacrylate) films obtained by electropolymerization

Electrochemical polymerization of aniline, on a Pt foil electrode coated with poly(methyl methacrylate) (PMMA), produces a homogeneous, free-standing, flexible, and conductive polymer film. The conductivity of the films depends on the aniline content and reaches 0.1-0.2 S/cm for films having aniline content of 15% or more. The optimum thickness of precoated PMMA to obtain durable conducting films was found to be in the range of 10-15 mu m. Cyclic voltammetric investigation revealed that aniline exhibits a similar electrochemical behavior on a PMMA coated platinum electrode similar to a bare Pt surface. The film gives a fast and reproducible response against ammonia gas within a concentration range of 1.0-0.01%. Scanning electron micrographs indicate that the films have a rough structure consisting of globular regions. (C) 1996 John Wiley & Sons, Inc

Conductive Composite Films Prepared Using Undoped Polyaniline And Poly(Methyl Methacrylate)

In this study, undoped polyaniline-poly(methyl methacrylate) films were cast from solutions containing different amounts of soluble part of undoped polyaniline and poly(methyl methacrylate) in dimethylformamide. The films contained undoped polyaniline up to 60% since the solubility of undoped polyaniline in dimethylformamide was 1.14 g/100 mL. The conductivity of undoped polyaniline-poly(methyl methacrylate) films were investigated after being redoped in some acids such as oxalic, nitric, and hydrochloric acids. When the films doped with hydrochloric acid was kept in air, the conductivity decreased gradually by 32%. Their temperature sensor behavior was examined in the range of -15 to 120 degreesC. The characterization of films was performed by conductivity measurement, FT-IR, UV, and TGA techniques.WoSScopu

The conductive polyaniline/poly(ethylene terephthalate) composite fabrics

Conductive composite fabrics were prepared by chemical polymerization of aniline on poly(ethylene terephthalate) (PET) fabrics in the aqueous hydrochloride acid solutions using potassium dichromate as the oxidant. The effect of the polymerization conditions such as temperature, oxidant, aniline and hydrochloride acid concentrations was investigated on the electrical surface resistance and polyaniline (PAn) content of PAn/PET composite fabrics. The maximum PAn content and the lower electrical resistance of composite fabrics were observed at the HCl concentrations of 0.25 M and 1.5 M, respectively. The electrical surface resistance of the PAn/PET composite fabrics was decreased under vacuum five-fold more than the ones kept under in air. The properties of PAn/PET composite fabrics such as density, diameter and moisture regain were also investigated in comparison with the those of pure PET. The conductive composite fabrics were characterized by surface resistance, FTIR and TGA techniques

Synteza i charakterystyka Poli(N-etylo aniliny) / Talk

A new substituted polyaniline/layered talc conductive composite material were synthesized chemically using ammonium persulfate as oxidizing agent in aqueous HCl medium. The oxidant type, N-ethyl aniline to oxidant mole ratio and N-ethyl aniline concentration on the PNEAn content and conductivity of the composite were investigated as the effect of the polymerization conditions. Optimum reaction conditions were outlined as NEAn/oxidant ratio 1 and 0.2 M NEAn monomer concentration with (NH4)2S2O8 on the poly(N-ethyl aniline) yield and conductivity. The conductive composites were characterized by two probe technique for surface resistance and thermo gravimetric analysis (TGA) techniques. The increased thermal stability of the composite compared to that of pure polymer was obtained by the thermogravimetric analysis method.Nowy przewodzący materiał kompozytowy podstawiony polianiliną/warstwowany talkiem zsyntetyzowano chemicznie przy użyciu nadtlenodisiarczanu amonu jako czynnika utleniającego w wodnym kwasie chlorowodorowym. Badano rodzaj utleniacza, anilinę N-etylową do stosunku molowego utleniacza oraz stężenie aniliny N-etylowej w PNEAn [Poly( N-ethyl aniline)] oraz przewodność kompozytu co jednocześnie było skutkiem warunków polimeryzacji. Optymalnymi warunkami jakie określono dla reakcji to NEAn/utleniacz w stosunku 1 oraz 0,2M stężenie monomeru NEAn wraz z (NH4)2S2O8 na polianilinie N-etylowej. Kompozyty przewodzące zostały scharakteryzowane przez badanie oporu powierzchni oraz analizę termograwimetryczną (TGA). Zwiększona stabilność termiczna kompozytu została porównana do tej z czystego polimeru została określona przez metodę termograwimetryczną

Polyaniline grafted polyacylonitrile conductive composite fibers for reversible immobilization of enzymes: Stability and catalytic properties of invertase

WOS: 000267619700014Polyacylonitrile fibers (PAN) surfaces were modified with chemical polymerization of conductive polyaniline (PANI) in the presence of potassium dichromate as an oxidizing agent. The effect of aniline concentration on the grafting efficiency and on the electrical surface resistance of PAN/PANI composite fibers was investigated. The surface resistance of the conductive composite fibers in this work was found to be between 8.0 and 0.5 k Omega/cm. As the amount of grafted PANI increased on the PAN fibers the electrical resistance of composite fibers decreased. The PAN/PANI composite fibers were characterized by SEM and FTIR studies. Composite PAN/PANI fibers were used for reversible immobilization of invertase. The immobilization efficiency and the activity of the immobilized invertase (from 1.0 mg/mL invertase solution at pH 5.5) were increased with increasing PANI contents of the composite fibers. The maximum amount of immobilized enzyme onto composite fibers containing 2.0% PANI was about 76.6 mg/g. The optimum pH for the free enzyme was observed at 5.0. On the other hand, immobilized invertase yielded a broad optimum PH profile between pH 5.0 and 7.0. Immobilized invertase exhibited 83% of its original activity even after two months storage at 4 degrees C while the free enzyme showed only 7% of its initial activity. (C) 2009 Elsevier Ltd. All rights reserved