Effect of some polyaromatic amines on the properties of NR and SBR vulcanizates

Helaly, F. M.; Darwich, Walid; El‐Ghaffar, M. A. Abd

doi:10.1016/s0141-3910(98)00197-9

Cited by 48 publications

(28 citation statements)

References 9 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The potential role of PANIs as antioxidants in rubber mixes [15,16] has already been considered, and the PANIs were shown to be efficient in slowing down the rate of oxidation, particularly when a methoxy-substituted PANI was used. Compounds with electron-donating substituents, which produce a resonancestabilized radical, were shown to have increased antioxidant activity.…”

Section: Introductionmentioning

confidence: 99%

Solid-state magnetic resonance studies of polyaniline as a radical scavenger

et al. 2005

View full text Add to dashboard Cite

The first detailed study of polyaniline (PANI) and reduced PANI (R-PANI) before and after reaction with the stable organic free radical 1,1-diphenyl-2-picrylhydrazyl (DPPH) by using solidstate 13C CP MAS (cross-polarization magic-angle spinning), NQS (nonquaternary suppressed) and CPPI (cross-polarization phase inversion) nuclear magnetic resonance teehniques is reported. These techniques reveal relatively subtle structural changes that occur upon reaction with DPPH free radicals and confirm the radical scavenging ability of PANI. The integrated intensity of the PANI CP MAS spectrum after reaction with DPPH is about 8% larger than that of PANI and this cannot be explained by an oxidation process alone. The increase is attributed to a decrease in the polaron concentration in the polymer, which is consistent with electron paramagnetic resonance (EPR) data that show a decrease of the EPR signal intensity after reaction of chemically synthesized PANI with DPPH.

show abstract

Section: Introductionmentioning

confidence: 99%

Solid-state magnetic resonance studies of polyaniline as a radical scavenger

et al. 2005

View full text Add to dashboard Cite

show abstract

“…[12] PANI and substituted PANIs have already been examined for their use as antioxidants in rubber materials. [13] However, their antioxidant ability in biological media needs to be examined to assess their likely activity in biomedical applications. [14] Recently, serious infections of microbe have become a social problem.…”

Section: Introductionmentioning

confidence: 99%

Non-conventional synthesis and antibacterial activity of poly(aniline-co-o-phenylenediamine)/bentonite nanocomposites

Al-Hussaini

Eldars

2013

Designed Monomers and Polymers

View full text Add to dashboard Cite

Copolymers of aniline and o-phenylenediamine/hydrophilic bentonite nanocomposites were synthesized by 5:1 M ratios of the respective monomers with different percentages of nanoclay via modified in situ chemical copolymerization. The results were justified by measuring the FT-IR for PANI-o-PDA/bentonite nanocomposites. The thermal stability was studied. PANI-o-PDA/bentonite nanocomposites were thermally more stable than pure polymer. The antibacterial activities of PANI-o-PDA/bentonite nanocomposites towards both Gram-positive and Gram-negative bacteria were investigated.

show abstract

“…Antioxidants have also been extensively used for the preservation of rubber materials [1]. Free radical mediated oxidation by molecular oxygen is a very important chemical process.…”

Section: Introductionmentioning

confidence: 99%

Size Dependent Antioxidant Activity of Polypyrrole Nanofibers

Kumar

Banerjee

Garg³

et al. 2011

AIP Conference Proceedings

View full text Add to dashboard Cite

Polypyrrole (PPy) nanofibers have been synthesized employing surfactant assisted miceller polymerization by varying the surfactant concentration. The synthesized nanofibers have been characterized using TEM, XRD, FTIR and UV-Visible spectroscopy. TEM reveals that the diameter of the PPy nanowires decreases with the increase in surfactant concentration. X-ray spectra shows an amorphous peak centered around 2 = 24.6 0 which is attributed to the - interaction of the partial PPy chains similar to that of aromatic groups. The domain length of the samples determined using the single-line approximation technique, decreases with decreasing diameter whereas the strain in the material increases, which have been attributed to the reduction of size with increase in the surfactant concentration as revealed by TEM. The vibrational bands observed from the FTIR spectra confirm the formation of surfactant free PPy nanowires.UV-Visible spectra shows a blue-shift in the - * absorption peak. Antioxidant activity of the samples has been determined using the DPPH free radical method. It has been observed that enhancement in free radical scavenging coincides with the decreasing diameter of the PPy nanofibers which has been associated with the increase in the surface reaction sites with the reduction of size.

show abstract

Effect of some polyaromatic amines on the properties of NR and SBR vulcanizates

Cited by 48 publications

References 9 publications

Solid-state magnetic resonance studies of polyaniline as a radical scavenger

Solid-state magnetic resonance studies of polyaniline as a radical scavenger

Non-conventional synthesis and antibacterial activity of poly(aniline-co-o-phenylenediamine)/bentonite nanocomposites

Size Dependent Antioxidant Activity of Polypyrrole Nanofibers

Contact Info

Product

Resources

About