Poly(o- and m-toluidine)–polystyrene blends: spectral, thermal and electrical properties

Conducting copolymers of imidazole and carbazole were chemically synthesized in various molar ratios of the imidazole and carbazole by chemical oxidative polymerization in acetonitrile medium using ammonium persulphate as oxidant. The selection and composition of solvent, concentration of the monomer, polymerization time, and temperature were optimized to obtain better quality and yield of the copolymers. The synthesized conducting copolymers were characterized by various techniques such as UVvisible, Fourier transform infrared, 1 H-NMR, and X-ray diffraction spectroscopy. The solubility of the copolymers was tested in various solvents. Their conductivity was tested at various temperatures. The thermodynamic stability of the copolymers was examined by differential scanning colorimetric and thermogravimetric analysis. The copolymers show comparatively higher conductivity, better solubility, and higher thermal stability than the homopolymer poly(carbazole) and lower than that of poly(imidazole).

Section: Solubility Of Imi/cz Copolymermentioning

confidence: 99%

Chemical synthesis, characterization, and properties of conducting copolymers of imidazole and carbazole

Raj

Madheswari²,

Ali

2010

“…A strong band and a weak band are observed. It can be seen from Table III that the wavelength of both the bands moves to lower value with increasing feed Imi content 33. Additionally, the relative intensity of the weak band becomes weak further with increasing Imi content.…”

Section: Resultsmentioning

confidence: 85%

“…It can be seen from Table III that the wavelength of both the bands moves to lower value with increasing feed Imi content. 33 Additionally, the relative intensity of the weak band becomes weak further with increas-ing Imi content. The continuous variation of wavelength and intensity of UV-Vis bands may result from the copolymerization effect of imidazole with pyridine.…”

Section: Solubility Of the Copolymersmentioning

confidence: 99%

Chemical synthesis, characterization, and properties of conducting copolymers of imidazole and pyridine

Raj

Madheswari²,

Ali

2011

A series of conducting copolymers were synthesized by chemical oxidative polymerization of imidazole (Imi) and pyridine (Py) in acetonitrile medium at ambient temperature. The yield, solubility, and conductivity of the copolymers were measured by changing the Imi/Py molar ratio from 0/100 to 100/0. The as-prepared Imi/Py conducting copolymers were characterized by UVVisible, FTIR, 1 H-NMR, DSC, TGA, and XRD. The results suggest that the resulting copolymers were more easily soluble in most of the organic solvents than in polyimidazole. The polymer obtained is a real copolymer containing imidazole and pyridine units, but the Imi content calculated on the basis of the proton NMR spectra is lower than feed Imi content. The thermostability of the Imi/Py copolymer increases with increasing Imi unit content. The copolymers show comparatively higher conductivity and higher thermal stability than the homopolymer polypyridine and are lower than those of polyimidazole.

“…Figure 8 shows the UV–vis spectra of two composite solutions with PPy/P2EAn ratios of 82:18 and 70:30 in DMSO. With increasing P2EAn content from 18 to 30%, the wavelengths of both bands (301 and 559) shifted to longer values (308 and 580), respectively 34. Moreover, the PPy/P2EAn (82:18) composite exhibited the transitions at much longer wavelengths than pure P2EAn.…”

Section: Resultsmentioning

confidence: 93%

Synthesis and properties of conducting polypyrrole, polyalkylanilines, and composites of polypyrrole and poly(2‐ethylaniline)

Sarı

Gök

şahi̇n

2006

Conducting polymers of alkylanilines, pyrrole, and their conducting composites were synthesized by oxidation polymerization. The oxidants used were KIO 3 and FeCl 3 for the polyalkylanilines and polypyrrole (PPy), respectively. Among the polyalkylanilines synthesized with KIO 3 salt, the highest conductivity was obtained with poly(2-ethylaniline) (P2EAn) with a value of 4.10 ϫ 10 Ϫ5 S/cm. The highest yield was obtained with poly(N-methylaniline) with a value of 87%. We prepared the conducting composites (PPy/P2EAn and P2EAn/PPy) by changing synthesis order of P2EAn and PPy. The electrically conducting polymers were characterized by IR spectroscopy, ultraviolet-visible spectroscopy, thermogravimetric analysis, and Xray diffraction spectroscopy. From the results, we determined that the properties of the composites were dependent on the synthesis order of the polymers. The thermal degradation temperature of PPy was observed to be higher than that of the other polymers and composites. We determined from X-ray results that the structures of the homopolymers and composites had amorphous regions (88 -95%) and crystal regions (5-12%). From the Gouy balance magnetic measurements, we found that the polymers and composites were bipolaron conducting mechanisms.