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À propos de : Role of Atmospheric Oxygen for the Polymerization ofInterleaved Aniline Sulfonic Acid in LDH        

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  • Role of Atmospheric Oxygen for the Polymerization ofInterleaved Aniline Sulfonic Acid in LDH
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  • New polymer/inorganic hybrid materials have been prepared by a two-step soft chemistryroute including the intercalation of aniline sulfonic acid between the sheets of a layereddouble hydroxide (LDH), Cu2Cr(OH)6Cl·nH2O, and its in situ polymerization at temperaturesbelow 473 K in air atmosphere. A combination of techniques, including X-ray diffraction,X-ray absorption spectroscopy at Cu, Cr, and S K-edge, electron spin resonance, and infraredspectroscopies, was used for their characterization. For the first time, a pure nanocompositewas successfully obtained. The interleaved polymer is found to be present under itsemeraldine salt form. In situ ESR measurements enable determination of the thermalcondition for the polymerization, showing the kinetic factor of the process. Like other lamellarnanocomposites, the atmospheric oxygen plays a major role for the polymerization process,although, here it is crucial, since no redox chemistry or external oxidizing agents areemployed. The monomer confinement and its matching with the layer charge density of thehost framework are found to be of great importance.
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