Preparation and characterization of a new polyaniline salt with good conductivity and great solubility in dimethyl sulfoxyde

Zeghioud, Hichem; Lamouri, Saad; Mahmoud, Yasmine; Hadj-Ali, Tarik

doi:10.2298/jsc150305064z

Cited by 23 publications

(10 citation statements)

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“…The initial weight loss in this range was associated with the removal of the rest of the strongly bound water. On the other hand, according to the obtained results and literature data, the weight loss was due to the presence of low-molecular polyaniline fractions in the material, which underwent gradual decomposition [ 38 ]. This process is characteristic for PANI degradation, which is why it indicated its presence in the fiber.…”

Section: Resultsmentioning

confidence: 96%

“…In the case of the PAN/PANI in situ fibers’ heating curve, a wide endothermic peak was seen with a maximum at 50 °C, associated with the removal of poorly bound water. An endothermic peak was seen at 102 °C, associated with the desorption of strongly bound water to the PANI [ 38 ]. Subsequently, the glass transition in the PAN was observed at about 110 °C, but its exact value was difficult to accurately determine because of the overlap of both processes.…”

Section: Resultsmentioning

confidence: 99%

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The Preparation and Characterization of Polyacrylonitrile-Polyaniline (PAN/PANI) Fibers

et al. 2019

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The paper presents a method of modifying polyacrylonitrile (PAN) fibers using polyaniline (PANI). The PAN fibers were doped with polyaniline that was obtained in two different ways. The first consisted of doping a spinning solution with polyaniline that was synthesized in an aqueous solution (PAN/PANI blended), and the second involved the synthesis of polyaniline directly in the spinning solution (PAN/PANI in situ). The obtained fibers were characterized by the methods: X-ray powder diffraction (XRD), scanning electron microscope (SEM), fourier-transform infrared spectroscopy (FTIR), thermogravimetry (TG) and differential scanning calorimetry (DSC). Analysis of the results showed strong interactions between the nitrile groups of polyacrylonitrile and polyaniline in the PAN/PANI in situ fibers. The results of mechanical strength tests indicated that the performance of the PAN/PANI mixture significantly improved the mechanical parameters of polyaniline, although these fibers had a weaker strength than the unmodified PAN fibers. The fibers obtained as a result of the addition of PANI to PAN were dielectric, whereas the PANI-synthesized in situ were characterized by a mass-specific resistance of 5.47 kΩg/cm2.

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Section: Resultsmentioning

confidence: 96%

Section: Resultsmentioning

confidence: 99%

The Preparation and Characterization of Polyacrylonitrile-Polyaniline (PAN/PANI) Fibers

et al. 2019

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“…Recently, however, PANI has also been used in biomedical applications, and PANI-containing neural conduits and hydrogels have been designed for use in nerve regeneration. − PANI has three oxidized forms: pernigraniline, leuco-emeraldine, and emeraldine base . Emeraldine bases are more stable and have higher conductivity when protonated (emeraldine salt form), characterized by absorption pits at approximately 320 nm. , However, emeraldine salt powders are insoluble and cannot be easily processed or applied; eventually, however, they were found to have good dispersion and electrical conductivity in dimethyl sulfoxide (DMSO). , DMSO–PANI dispersions have excellent stability but cannot be formed at the nanometer scale alone. However, citrate-capped gold NPs can easily self-assemble into complexes with positively charged PANI, and thus benefit from gold NPs and PANI from nanostructure to microstructure …”

Section: Introductionmentioning

confidence: 99%

Fabrication of Nanocomposites Complexed with Gold Nanoparticles on Polyaniline and Application to Their Nerve Regeneration

Kim

Lee

Park

et al. 2020

ACS Appl. Mater. Interfaces

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Electrically conductive materials can stimulate stem cells through electric shock and thereby contribute to the regulation of cell proliferation and differentiation. Recently, polymer–metal complexes composed of polyaniline and gold nanoparticles have emerged as novel candidates for use in regenerative medicine. By mixing two different materials, such composites maximize the benefits while alleviating the disadvantages of using either material alone. Based on their excellent conductivity, these complexes can be applied to nerve regeneration using stem cells. In this study, we investigated a method for producing hybrid nanocomposites by complexing gold nanoparticles to polyaniline and tested the resultant composites in a model of nerve regeneration. We manipulated the shape, size, and electrical conductivity of the hybrid composites by compounding the component materials at various ratios. The most efficient nanocomposite was named conductive reinforced nanocomposites (CRNc’s). When the CRNc was delivered directly to cells, no cytotoxicity was observed. After the intracellular delivery of the CRNc, the stem cells were electrically stimulated using an electroporator. As a result of performing mRNA-sequencing (Seq) analysis after electrical stimulation (ES) of the CRNc-internalized cells, it was confirmed that the CRNc-internalized cells have a pattern similar to that of the positive group-induced neuron cells. In particular, microtubule-associated protein 2 is more than twice that of the control group (negative control), and the nerve fiber protein is strongly expressed as in the positive control group. In addition, we verified that neural differentiation progressed by monitoring the growth of neurites from stem cells. Together, these findings show that the CRNc can be used to induce the formation of neuron-like cells by applying ES to stem cells.

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“…3,42 The peak at 1315 cm -1 is related to the C-N stretching vibration of the urethane group. 43,44 Relative increase in the intensity of the characteristic peaks of C-N and the free CO function of PUR 4 were also observed.…”

Section: Characterization Of Montmorillonitementioning

confidence: 83%

Elaboration of nanostructured polyurethane foams/OMMT using a twin-screw extruder in counter-rotating mode

Mahmoud

Safidine

Zeghioud

2018

JSCS

Self Cite

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In this work, a new elaboration method for nanostructured foam polyurethane/organo-modified montmorillonite (PUR/OMMT) by in situ polymerization is proposed. A twin-screw extruder in the contra-rotation mode combined with reaction injection molding (RIM) as the polymerization process was used. The blended polyols, copolymer polyol (CPP) were included between the OMMT layers via the twin-screw extruder. Both the formulation of the PUR and the inter-foliar distance in the montmorillonite (MMT) were optimized. The effect of some parameters such as OMMT content and catalyst (triethylenediamine for PUR 3 and triethylenediamine+diamino-1,2 propane for PUR 4) was also investigated. The synthesized materials (OMMT, PUR and PUR/OMMT) were characterized by different methods, i.e., Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD) and scanning electron microscopy (SEM). The results of evaluation tests, such as flammability and the tensile for the PUR 3+OMMT foams revealed that the optimum properties were obtained for PUR 3+2 % OMMT. The PUR 4 foam showed better mechanical and flame--retardant properties than the PUR 3 (r = -NCO/-OH = 1.15) foam. However, the PUR 4 + 2 % OMMT formula exhibited the most delayed flame diffusion and pronounced rigidity.Available on line at www.shd.org.rs/JSCS/ 1364 MAHMOUD, SAFIDINE and ZEGHIOUD motive, naval, furniture and building industries, and for shock absorption, padding and thermal or acoustic insulation. 1-5 PUR foams are present in all areas of daily life due to their various properties and applications. Despite all these advantages, these foams can constitute a peril in the event of fire. Currently, public opinion is very aware of this inflammability problem. Among the solutions to address this issue is the addition of organic flame-retardants in the polymer matrix. 6-8 However, most organic flame-retardants emit toxic gases.Nevertheless, both researchers and industrialists are interested in finding other solutions, such as the addition of graphite, 9-12 fibers, 13,14 montmorillonite, 15-26 nanocoating, 27,28 etc. The addition of montmorillonite in the polyurethane imparts noteworthy improvement to the relevant properties, especially if it is distributed on the nanometric scale. It enhances mechanical, thermal, barrier and flame retardant properties. 3 These improvements depend on the type of polymer, the ingredients used, the preparation process and the dispersion of the clay in the matrix. 3,29,30 Much work on the development of polyurethane foams modified with montmorillonite are reported in the literature. 15,[21][22][23][31][32][33] However, the use of a combination of grafted polyol (CPP) and polymeric diphenylmethane diisocyanate (PMDI) and/or diamino-1,2 propane as a catalyst has not been considered.The main goal of the present study consisted in the preparation of nanostructured foam polyurethane/OMMT with enhanced mechanical and flame-retardant properties. In order to incorporate the grafted polyols into the OMMT galleries, a twin-screw extruder oper...

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Preparation and characterization of a new polyaniline salt with good conductivity and great solubility in dimethyl sulfoxyde

Cited by 23 publications

References 1 publication

The Preparation and Characterization of Polyacrylonitrile-Polyaniline (PAN/PANI) Fibers

The Preparation and Characterization of Polyacrylonitrile-Polyaniline (PAN/PANI) Fibers

Fabrication of Nanocomposites Complexed with Gold Nanoparticles on Polyaniline and Application to Their Nerve Regeneration

Elaboration of nanostructured polyurethane foams/OMMT using a twin-screw extruder in counter-rotating mode

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