Modification induced by gamma irradiation in polystyrene/poly(methyl methacrylate) blends / Samir A. Nouh in INTERNATIONAL POLYMER PROCESSING, Vol. XXXII, N° 2 (05/2017)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XXXII, N° 2 (05/2017) . - p. 253-259 Titre : Modification induced by gamma irradiation in polystyrene/poly(methyl methacrylate) blends Type de document : texte imprimé Auteurs : Samir A. Nouh, Auteur ; K. Benthami, Auteur ; A. Abou Elfadl, Auteur ; Huda A. El-Nabarawy, Auteur Année de publication : 2017 Article en page(s) : p. 253-259 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Alliages polymères Films plastiques -- Propriétés optiques Polymères -- Propriétés optiques Rayons gamma Rhéologie Traitement par irradiation Viscosité Index. décimale : 668.4 Plastiques, vinyles Résumé : The influence of gamma irradiation on the structural and optical properties of polystyrene/poly(methyl methacrylate) (PS/PMMA = 50/50 w/w %) blend films have been investigated. A dose range of 20 kGy to 400 kGy is covered. Applying the viscometry technique, the dose dependence of the intrinsic viscosity was investigated. In addition, the variation of refractive index with gamma dose was studied. The observed increase in the intrinsic viscosity from 0.45 up to 0.69 and the refractive index in the high dose range indicates that the predominant induced process by gamma irradiation is crosslinking, which reduces the free volume and increases the average molecular weight leading to a more compact structure of PS/PMMA samples. Fourier Transform Infrared (FTIR) and ultraviolet-visible (UV-VIS) spectroscopies were applied to identify the chemical structure and to investigate the major process that is induced by irradiation. Moreover, using UV-vis spectroscopy, optical energy gap, Urbach energy and color changes were evaluated. The results reveal that the optical energy gap has arisen from direct transitions. The color intensity ?E was significantly decreased with increasing the dose up to 400 kGy. Note de contenu : - EXPERIMENTAL : Preparation of PS/PMMA thin films - Irradiation facilities - Characterization - RESULTS AND DISCUSSION : FTIR studies - Molecular studies - Optical studies DOI : 10.3139/217.3342 En ligne : https://drive.google.com/file/d/1u8FZsSeeqV3jEEj_muu29sDzhBiGqob6/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=28523 [article]

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Modification induced in light diffusing polycarbonate due to proton irradiation / Samir A. Nouh in INTERNATIONAL POLYMER PROCESSING, Vol. XXX, N° 3 (07/2015)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XXX, N° 3 (07/2015) . - p. 390-396 Titre : Modification induced in light diffusing polycarbonate due to proton irradiation Type de document : texte imprimé Auteurs : Samir A. Nouh, Auteur ; S. K. Alghamdi, Auteur ; B. O. Alsobhi, Auteur ; K. Benthami, Auteur ; N. T. El-Shamy, Auteur Année de publication : 2015 Article en page(s) : p. 390-396 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Colorimétrie Irradiation Polycarbonates Protons Réfraction, Indice de Index. décimale : 668.4 Plastiques, vinyles Résumé : Light diffusing polycarbonate samples were exposed to protons fluences at levels between 1011 and 1016 p/cm2. The variation of the refractive index and color intensity with the proton fluence has been studied. The results show that the polycarbonate samples acquire color changes under proton irradiation. Furthermore, thermogravimetric analysis has been performed. It was found that both the onset temperature and activation energy of thermal decomposition are affected by the proton fluencies owing to the degradation and crosslinking processes. Moreover, structural property studies using X-ray diffraction, intrinsic viscosity and Fourier transform infrared spectroscopy were performed. Note de contenu : - EXPERIMENTAL : Samples - Irradiation facilities - Analysis of the irradiated samples - RESULTS AND DISCUSSION : Optical properties - Thermo-gravimetric analysis - Structural properties DOI : 10.3139/217.3054 En ligne : https://drive.google.com/file/d/10x7HUfJ0F2p10xFaeBUgxaUQnRBwjxKx/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=24334 [article]

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