eng
National Information and Documentation Centre (NIDOC), Academy of Scientific Research and Technology, ASRT
Egyptian Journal of Chemistry
0449-2285
2357-0245
2012-12-30
55
6
561
581
10.21608/ejchem.2012.1174
1174
Improvement of the Surface Activity and the Solubility for Some Synthesized Polyaniline Surfactants
SOME monomeric surfactants namely, 3(6- sodium sulfonate hexacyloxy) aniline (MC
6), 3(10- sodium sulfonate decyloxy) aniline (MC10) and 3(12- sodium sulfonate dodecyloxy) aniline (MC12) and their analogous polymers were synthesized. Different techniques were used to characterize the synthesized monomeric and their analogous polymeric surfactants such as ultraviolet-visible (UV), thermal gravimetric analysis (TGA), X-ray and scanning electron microscopy (SEM) techniques. The surface tension technique was used to investigate the surface properties of these surfactants at different temperatures. The critical micelle concentration (CMC) results showed the improvement in the solubility of the synthesized polymeric surfactants according to the effect of the hydrophobic and hydrophilic moieties in their chemical structure. The surface parameters showed the ability of monomeric and their analogous polymeric surfactants for adsorption at the air / water interfaces and decreased the surface tension. The thermodynamic parameters revealed that the micellization process is spontaneous for all investigated surfactants as a result of the improvement of the solubility of these surfactants.
https://ejchem.journals.ekb.eg/article_1174_d6742e3f0f505693d9b65e561eec11a4.pdf
Monomeric and polymeric aniline surfactants
Solubility
Surface properties and Thermodynamic parameters
eng
National Information and Documentation Centre (NIDOC), Academy of Scientific Research and Technology, ASRT
Egyptian Journal of Chemistry
0449-2285
2357-0245
2012-12-30
55
6
583
602
10.21608/ejchem.2012.1175
1175
Corrosion Inhibition of Aluminium with A Series of Aniline Monomeric Surfactant and Their Analogues Polymers in 0.5 M HCl Solution Part І: 3-(6- Sodiumsulfonate hexayloxy) Aniline Monomeric Surfactant (MC6) and Its Analogues Polymer
THE INHIBITION effect of 3-(6- sodiumsulfonate hexayloxy) …...aniline monomeric surfactant (MC6) and the analogues polymer poly 3-(hexayloxy sulphonic acid) aniline (PC6) on the corrosion of aluminium in 0.5 M HCl solution was investigated with weight loss and potentiodynamic polarization techniques. The results show that the inhibition occurred through the adsorption of inhibitor molecules on the metal surface. The inhibition efficiency was found to increase with increasing of inhibitor concentration and decrease with increasing temperature. It was found that these inhibitors acted as mixed–type inhibitors with anodic predominance. The adsorption of these compounds on the metal surface obeyed the Langmuir and Frumkin adsorption isotherms. Thermodynamic functions for both the dissolution and adsorption processes were determined. The obtained results from weight loss and potentiodynamic polarization techniques are in good agreement.
https://ejchem.journals.ekb.eg/article_1175_d53ba850264b871c7da0446526b2a55f.pdf
Activation energy
Adsorption
Conducting polymers
Electro-chemistry and Surfactants
eng
National Information and Documentation Centre (NIDOC), Academy of Scientific Research and Technology, ASRT
Egyptian Journal of Chemistry
0449-2285
2357-0245
2012-12-30
55
6
603
623
10.21608/ejchem.2012.1176
1176
Infrared Spectroscopic Studies on Some Thermally Degraded Poly(methyl methacrylate) Doped with N,N,N´,N´- tetraoxaloyl Para Sulphanilamide
INFRARED (IR) spectroscopic studies were performed for some …..poly (methyl methacrylate)(PMMA) samples prepared in absence and presence of N,N,N`,N`-tetraoxaloyl-p-sulphanilamide after the extraction of the dopant during thermal treatment. There were no drastic changes in the IR absorption bands position, but noticeable changes in the band intensities were found. The relative transmission of IR absorption bands, such as those at 1070, 1242, 1444 and 1730 cm-1, were measured with respect to the transmission of the methyl group band at 1388 cm-1 (the most stable band during thermal treatment). By using the combined technique of transmission data of C-C skeletal vibration C-O, CH2 and C=O bands with respect to the transmission band of methyl group and measuring the area under the curve for the degradation and recombination zones, the protection efficiency of the organic dopant in the PMMA matrix against thermal degradation could be explained.
The protection mechanism of the organic dopant was confirmed by measuring the mass spectrum of the organic dopant for determination of different organic radicals that could be produced during thermolysis. Measuring 13C-NMR of the PMMA-organic dopant after the extraction of the dopant confirms the presence of phenyl moieties in the polymeric chains.
The degradation and recombination mechanism of different groups in the polymeric chain units or backbone scission during thermal treatment could be explained by the behavior of the relative transmission data with increasing temperature. The protection efficiency of the organic dopant was found to be the maximum in presence of 7% of the organic dopant in the PMMA matrix.
https://ejchem.journals.ekb.eg/article_1176_b104f526b45bf5382650e511e01952d0.pdf
Poly (methyl methacrylate)
Thermal Degradation
Protection efficiency and Organic ligand
eng
National Information and Documentation Centre (NIDOC), Academy of Scientific Research and Technology, ASRT
Egyptian Journal of Chemistry
0449-2285
2357-0245
2012-12-30
55
6
625
638
10.21608/ejchem.2012.1177
1177
Synthesis of Nonionic Surfactants by Treating Some Petroleum Derivatives
DODECYL benzene sulphonic acid was used in preparation of a series of nonionic surfactants (II - V) a-c. The preparation was completed by the reaction of dodecyl benzene sulphonic acid with thionyl chloride followed by the alkylene diamine series (n = 2, 4, 6, 8) to give Ia-d, respectively. The later products (Ia –d) were reacted with ethylene oxide to produce nonionic surfactants (II - V) a-c. The structures of the prepared nonionic surfactants were confirmed by IR and 1HNMR spectra. The surface properties, biodegradability and biological activities of the prepared compounds were investigated. The obtained data show that these compounds have good surface and biological activities besides, reasonable biodegradability properties.
https://ejchem.journals.ekb.eg/article_1177_e8c2b52f2b936de12017babe0e43411f.pdf
eng
National Information and Documentation Centre (NIDOC), Academy of Scientific Research and Technology, ASRT
Egyptian Journal of Chemistry
0449-2285
2357-0245
2012-12-30
55
6
639
647
10.21608/ejchem.2012.1178
1178
Solid Phase Synthesis of I25 Labeled Insulin Fragments. Part III. Synthesis of 125-I-Insulin Fragment B15-18 Leu-Tyr(I2)-Leu-Val
NOWA DAYS, synthesis of biological active peptides has been found in an impressive success. This has been achieved by development of new techniques, using new reagents and easy reach.
A new approach to radio-peptides synthesis has been investigated in an effort to overcome the technical difficulties of separation, purification and identification of the prepared peptide fragments. In a series of solid-phase peptide synthesis of labeled insulin fragments, we have prepared 125-I-Insulin fragment Bl 5-18. In this research work we discussed the synthesis of Insulin fragment B15-18 Labeled with Leu-Tyr(I
2 )-Leu-Val.
https://ejchem.journals.ekb.eg/article_1178_b4aae92fecb8403a4855c5b6fedcdeee.pdf
Amino acids
Insulin
iodine 125
Labeling
Peptide hormones and Synthesis
eng
National Information and Documentation Centre (NIDOC), Academy of Scientific Research and Technology, ASRT
Egyptian Journal of Chemistry
0449-2285
2357-0245
2012-12-30
55
6
649
658
10.21608/ejchem.2012.1179
1179
Factors Affecting the Catalytic Hydrogenation of p-Nitrophenol by Nano Nickel Supported on Egyptian Kaolin
THE LIQUID-PHASE catalytic hydrogenation of p-nitrophenol to ……p-aminophenol was studied over kaolin supported nano-nickel catalysts prepared by chemical reduction by hydrazine hydrate. It was found that the 5% Ni-K catalyst has a superior catalytic activity corresponding to the other nickel contents, and hence it was chosen for determining the optimum conditions of such reaction. The effect of catalyst loading, p-nitrophenol concentration, NaOH and NH4OH concentrations on the catalytic activity of nano-nickel catalyst was investigated at 80oC. It was assessed that the catalytic efficiency of the catalyst was enhanced considerably by changing in NaOH and NH4OH concentrations during hydrogenation reaction.
https://ejchem.journals.ekb.eg/article_1179_4867811919691919fa61bce3ceacc521.pdf
Nano-nickel catalyst
Egyptian kaolin support and Hydrogenation