H. M. Abd El-Salam

Synthesis and characterization of crystalline poly(N-(2-hydroxyethyl)aniline) microspheres

Poly(N-(2-hydroxyethyl)aniline) microsphere was prepared in aqueous hydrochloric acid (HCl) in one step, using ammonium persulphate as an oxidant. The effect of monomer, oxidant, HCl concentrations and temperature on polymerization rates was investigated. The data show that polymerization rate increases with increasing reactant concentrations. In addition, the initial rate increases with raising the temperature. The apparent activation energy found was 57.4319 kJ/mole. Also, ΔH* and ΔS* found were 55.0691 kJ/mole and 78.3662 J/mole K respectively. Infrared and proton nuclear magnetic resonance spectroscopies, thermogravimetric analysis, X-ray diffraction, scanning electron microscopy and elemental analysis characterize the obtained polymer sample to confirm the suggested structure. The mechanism of the polymerization reaction are discussed.

Synthesis and characterization of poly(2-aminothiophenol-co-2-methylaniline)/silver nanoparticles as antisulfate-reducing bacteria

ABSTRACT Poly(2-aminothiophenol) (P2ATH), poly(2-methylaniline) (P2MeANI), and poly(2ATH-co-2MeANI) are synthesized using ammonium persulfate as an oxidant in aqueous hydrochloric acid (HCl) medium at room temperature. The obtained polymeric samples are assembling on silver nanoparticles. The structures of prepared polymeric samples are characterized by ultraviolet–visible, infrared, proton nucleus magnetic resonance (1H NMR), X-ray diffraction, electron microscope, transmittance electron microscope, and thermogravimetric analysis. The antibacterial efficiency of the prepared polymeric and polymer/Ag nanoparticle samples is studied for the removal of sulfate-reducing bacteria. The results reveal that the assembling of both P2ATH and P2MeANI on Ag nanoparticles enhances the antisulfate-reducing bacteria’s efficiencies, but in a case of P2ATH-co-2MeANI the efficiency is more than its Ag nanoparticles. GRAPHICAL ABSTRACT

SPECTROSCOPIC STUDY ON POLY(ACRYLIC ACID-CO-ACRYLAMIDE)-GRAFT–POLYANILINE AS A RADIATION DOSIMETER FOR ALPHA PARTICLES

Poly(acrylate-co-acrylamide) was a synthesis by chemical oxidation polymerization of an aqueous binary mixture of acrylate/acrylamide (1:1 mole ratio) using ammonium persulphate as an initiator at 70°C under the nitrogen atmosphere. The obtained copolymer was introduced for grafting with polyaniline. The grafting process was performed by chemical oxidation polymerization of aniline using ammonium persulphate as an initiator in hydrochloric acid media at 40°C under the nitrogen atmosphere. Poly(acrylic acid-co-acrylamide)-graft-polyaniline samples irradiated with (alpha-particles) at different irradiation doses (0, 2.33, 8.73, 13.09 and 17.46 Gy) at the same linear energy transfer. The change in the morphology, optical properties and the energy gap of poly(acrylic acid-co-acrylamide)-graft-polyaniline samples were studied.

Kinetic preparation and antibacterial activity of nanocrystalline poly(2-aminothiophenol)

Poly(2-aminothiophenol) (PATH) was prepared by oxidative chemical polymerization of 2-aminothiophenol in aqueous HCl medium using ammonium persulfate as oxidant. The obtained polymer sample was characterized using different techniques. The kinetics of polymerization reaction were investigated. The data show that both initial and overall reaction rates increase with increasing monomer, oxidant and HCl concentrations. Also both initial and overall polymerization reaction rates increase with increasing temperature. The nanostructure of the prepared PATH was fabricated with silver nanoparticles. The antibacterial activity of the synthesized polymer and its nanostructure with silver nanoparticles was studied against sulfate-reducing bacteria. The synthesized polymer and its nanostructure showed good antibacterial activity.

Facile polyacrylamide graft based on poly (2-chloroaniline) silver nano-composites as antimicrobial

ABSTRACT Series of polymers based on the grafting of polyacrylamide with both poly(2-methoxyaniline) P2-MeOANI and poly(2-chloroaniline) P2-ClANI were synthesized by the oxidative chemical grafting copolymerization of individually 2-methoxyaniline (2-MeOANI) and 2-chloroaniline (2-ClANI) onto polyacrylamide (PACM). The grafting was performed in aqueous hydrochloric acid solution (HCl) using ammonium persulfate (APS) as oxidant. The optimum conditions of the grafting based on the yield was achieved. The obtained polymer samples at optimum conditions were assembling on colloidal silver nanoparticles (AgNPs). The obtained polymer samples and their AgNPs were characterized by UV- visible & IR spectroscopy, EM, TEM & TGA to confirm the suggested structure of obtained polymers. The efficiency of the prepared polymeric samples to using as anti-microbial including as sulfate reducing bacteria (SRB) was investigated. GRAPHICAL ABSTRACT