Browsing by Author "Hattab, Youcef"

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    Cours de rayonnement
    (University of sciences and technology in Oran, 2016-09-26) Hattab, Youcef
    Le but de ce cours est de rappeler les notions essentielles déjà vues en partie en lycée, permettant de définir le rayonnement et leurs mesures. Ce manuscrit est destiné au étudiants universitaires de première cycle en sciences et techniques, sciences de la matière et peuvent aider tous la spécialité qui ont un programme de chimie et physique L1.
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    Thermal stability and structural characteristics of PTHF–Mmt organophile nanocomposite
    (University of sciences and technology in Oran, 2015-04-20) Hattab, Youcef; Benharrats, Nassira
    Polymer nanocomposites represent a new class of material alternative to conventionally filled polymers. This new class of material is synthesized from a mixed polymeric matrix at a weak percentage with ontmorillonites as inorganic charges. Their dispersion is facilitated by the organophilization of their structure by the exchange of inside foliar cations with compatilization possessed at once hydrophiles and hydrophobes ends, respectively, to be compatible with clay and polymer. The objective of this study is to use organophilized montmorillonites in the presence of monomer tetrahydrofuran to obtain polytétrahydrofuran montmorillonites (PTHF–Mmt) of composites by polymerization in situ. The organophilisation of the Mmt is formed by active cationic surface.The obtained results show an increase in the distance inside the reticular in the diffractograms of X-rays (DRX) and the appearance of absorption bands of the characteristics of polytétrahydrofuran on the spectra of infrared spectroscopy (IR), which indicate pre-polymerization of tetrahydrofuran in the galleries of clay and, therefore, the obtaining of a nanocomposite. We have also studied the thermal stability of the samples by differential analysis calorimetric (DSC) analysis, and we can conclude that the nanocomposites are stabilized thermally by the presence of clay in the matrix. 2011 King Saud University. Production and hosting by Elsevier B.V. All rights reserved