Novel carboxyl functional spherical electromagnetic polypyrrole nanocomposite polymer particles with good magnetic and conducting properties

Abstract

Magnetic conducting nanoparticles with reactive functional groups are attractive materials for applications in electromagnetic interference shielding, magneto-optical storage, biomedical sensing, gas and humidity sensors, flexible electronics etc. The objective of this work was to prepare carboxyl functionalized polypyrrole (PPy) nanocomposite particles having good magnetic properties. Electromagnetic PPy nanostructures, abbreviated as PPy/γ-Fe2O3, were first prepared by a chemical one-step method. In this reaction process FeCl3 is used as an oxidant for the polymerization of pyrrole and as a source of Fe3+ for the formation of γ-Fe2O3. The formation of γ-Fe2O3 is also aided by the initial presence of Fe2+, and p-toluenesulfonic acid (p-TSA) acted as a dopant. The effects of different stabilizers on the stability and morphology of PPy/γ-Fe2O3 particles were evaluated. The presence of citric acid/sodium dodecyl sulfate during chemical oxidative polymerization produced a relatively stable PPy/γ-Fe2O3 colloidal emulsion. PPy/γ-Fe2O3/poly(methylmethacrylate-methacrylic acid) (PPy/γ-Fe2O3/P(MMA-MAA)) nanocomposite polymer particles were then prepared by the seeded copolymerization of MMA and MAA in the presence of magnetic PPy/γ-Fe2O3 nanocomposite seed particles. The structure and morphology of the prepared nanocomposites were confirmed by different instrumental techniques such as Fourier transform IR spectroscopy, UV−visible spectroscopy, electron micrographs, XRD and X-ray photoelectron spectroscopy. The electrical and magnetic properties were also investigated. The carboxyl functional electromagnetic PPy nanocomposite polymer particles should be useful for the immobilization of drugs or biomolecules to design electrically stimulated drug delivery systems for modulating the activities of nerve, cardiac, skeletal muscle and bone cells. © 2016 Society of Chemical Industr

Impact of mesoporous SiO2 support for Ni/polypyrrole nanocomposite particles on their capacitive performance

“…The initial mass loss up to 150 °C is due to the loss of moisture, the second mass loss up to 265 °C is due to the decomposition of the PPy oligomer and the final extended mass loss region (265–680 °C) is attributed to the elimination of the PPy main chain via decomposition. 54 Comparatively, in H 2 N-SiO 2 /Ni/PPy nanocomposite particles (Fig. 4d) the onset decomposition temperature of the PPy main chain is shifted to a higher temperature (300 °C).…”

“…53 The signals at 1044 and 924 cm −1 are assigned to the C–H in-plane bending and the ring deformation. 54 On the other hand, the spectrum of H 2 N-SiO 2 /Ni/PPy nanocomposite particles (Fig. 1Be) is dominated by the characteristic signals of PPy.…”

Conducting polymer/hydrogel hybrid free-standing electrodes for flexible supercapacitors capable of self-sensing working conditions: large-scale fabrication through facile and low-cost route

“…The major challenges experienced by CPs in developing electrochemical devices for practical applications are their poor mechanical strength and lack of processability as well as the less electrochemical cycling stability as a consequence of the structural degradation caused by repeated swelling/ shrinking during oxidation/reduction of polymer chains. Various strategies have been proposed by researchers to overcome these drawbacks: derivatization of the polymer backbone; copolymerization with substituted monomers and introduction of lengthy substituent groups, sulfonic acid groups or carboxyl groups into the main chain [16][17][18][19][20][21]; the preparation of composites/hybrid/blend with processable polymers [22][23][24][25][26]; the use of surfactants [27]; incorporation of metallic nanoparticles [28,29] or using polymeric/hydrogel nano bers and micro bers as templates [30][31][32][33][34]. In this work, hybrid lms were fabricated by adopting a facile and low-cost strategy suitable for large-scale production by the incorporation of CP (polyaniline) with a biocompatible hydrogel (Chitosan) in view to develop mechanically stable electrode materials.…”

Layer‐by‐layer preparation of electromagnetic NH2‐SiO2/polypyrrole/Ni nanocomposites, characterization and their electrochemical properties

“…To overcome these limitations, researchers are showing interest in designing new electroconducting stable composites comprising an organic or inorganic core and a PPy shell 10,21–29 . Also, in some investigations PPy particles have been used as core particles for modification with polymer or inorganic nanoparticles 6,14,30–33 …”

“…Organic conducting polymers, principally polyaniline, polythiophene and polypyrrole (PPy), have vast application prospects in bioelectronics, [1][2][3] biomedical applications, [4][5][6][7] drug delivery, 8,9 energy storage devices, [10][11][12][13] water purification, [14][15][16][17] etc. Among these conducting polymers, PPy is attracting much attention because it offers certain advantages like high conductivity, redox property, high environment stability, biocompatibility and easy synthesis.…”