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Arish, Egypt

The N-amino phenyl maleimide (N-APhM) and N-amino phenyl 2,3 dimethyl maleimide (N-APhDiMeM) derivatives were prepared by the condensation of phenyl hydrazine with maleic anhydride and 2,3 dimethyl maleic anhydride respectively. 13C NMR spectroscopy proved the formation of the symmetric amino maleimide structure and not the pyridazinone or aminoisomaleimides. The copolymerization of acrylonitrile with the (N-APhM) and (N-APhDiMeM) were prepared using ultrasound. The thermal behavior of the prepared copolymers, under nitrogen atmosphere, was investigated using thermogravimetry (TG) techniques. The dyeing of the copolymers formed has been studied using both conventional and ultrasonic techniques. The effect of dye bath pH, ultrasonic power, dyeing time and temperature were studied. Color strength values obtained were found to be higher using ultrasound than with conventional heating. The results of fastness properties of the dyed copolymers were also studied. © 2012 Elsevier B.V. All rights reserved. Source

Abdel-Naby A.S.,Fayium University
Journal of Applied Polymer Science | Year: 2011

Acrylonitrile was copolymerized with four N-(substituted phenyl)itaconimide in dimethyl formamide using azobisisobutyronitrile as initiator. The structural characterization of the copolymers was done using FTIR, UV/vis, and elemental analysis. Thermal characterization of the copolymers was done using thermogravimetry (TG) and differential thermal analysis (DTA) data, which showed a remarkable improvement in the thermal behavior of the investigated copolymers. The acrylonitrile/bromophenyl itaconimide copolymer possessed the best thermal property. The investigation of the dyeing properties of the acrylonitrile-N-(substituted phenyl)itaconimide showed good affinity toward basic dyes as well as appreciable improvement in their color fastness toward UV light. © 2011 Wiley Periodicals, Inc. Source

Abdel-Naby A.S.,Fayium University | Al-Ghamdi A.A.,University of Dammam
International Journal of Biological Macromolecules | Year: 2014

Cellulose acetate (CA) was modified using N-(phenyl amino) maleimides (R-APhM) where, RH or 4-NO2. The structure of the modified polymer was characterized by 13C-NMR. The chemical modification is based on the reaction between the acetyl group of the glucopyranose ring in cellulose acetate and the proton of the amino group in N-(phenyl amino) maleimide molecule. The thermal gravimetry (TGA) was used to investigate the thermal stability of the modified polymeric samples. The modified cellulose acetate by 4-nitro (phenyl amino) maleimide (CA/4-NO2APhM) exhibits the highest thermal stability as compared to the N-(phenyl amino) maleimide (CA/APhM) and the unmodified CA. The crystallinity and morphology of the modified polymeric samples were investigated using X-ray diffraction (XRD) and emission scanning electron microscope (ESEM), respectively. The presence of N-(phenyl amino) maleimide moieties in the cellulose acetate matrix improved its mechanical property. Also, the organic nature of (R-APhM) moieties inside CA matrix reduced its wettability. © 2014 Elsevier B.V. Source

Abdel-Naby A.S.,Fayium University | Al-Ghamdi R.F.,King Faisal University | Al-Ghamdi A.A.,King Faisal University
Journal of Vinyl and Additive Technology | Year: 2010

Tin, nickel, cobalt, zinc, and copper complexes of cyanoguanidine and urea were synthesized and investigated as thermal stabilizers for rigid poly(vinyl chloride) at 180°C in air. Their stabilizing efficiencies were evaluated by measuring the induction period (the period during which no evolved hydrogen chloride could be detected) and the rate of dehydrochlorination as determined by continuous potentiometric measurements, in addition to the extent of discoloration. The results clearly revealed the greater efficiency of all of the investigated metal complexes as compared to those of well-recognized reference stabilizers. The tin complex always exhibited the highest efficiency irrespective of the type of ligand used. The nickel and cobalt complexes also possessed high stabilizing efficiencies. The order of the stabilizing potency of the various metal complexes was Sn ⋙ Co, Ni ≫ Zn, Cu. Combining the ligand itself with dimethyltin-s, s′-bis (isooctyl thioglycolate), as a reference stabilizer containing a tin atom, led to a true synergism. This synergistic effect might be attributed to the formation in situ of a complex between the ligand and the tin atom. © 2010 Society of Plastics Engineers. Source

Abdel-Naby A.S.,University of Dammam | Abdel-Naby A.S.,Fayium University | Aboubshait S.A.,University of Dammam
Journal of Thermal Analysis and Calorimetry | Year: 2013

Cellulose acetate (CA) was blended in different compositions with various acrylonitrile-N-halo phenyl maleimide (AN-XPhM) copolymers to improve the thermal and mechanical properties of cellulose acetate. The structure, morphology, thermal stability, and crystallinity of the blend films were characterized by infrared spectroscopy, scanning electron micrographs, thermogravimetry/differential thermal analysis, differential scanning calorimetry, and X-ray diffraction. The results revealed that the thermal stability was improved by the increase in AN-XPhM content, irrespective of the type of the N-halo phenyl maleimide. The CA/AN-4BrPhM blend films possessed the highest thermal stability compared to the other CA/AN-XPhM blend films. Blending CA with AN-4BrPhM yielded the most homogeneous blend films, irrespective of the composition ratio. The mechanical properties of various compositions of the CA/AN-4BrPhM blend films were also discussed. © 2013 Akadémiai Kiadó, Budapest, Hungary. Source

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