Caractérisation de la surface de pigments traités par des polyesters acryliques

Abstract : This work is devoted to the surface treatment by acrylic polyesters of aluminum, iron and titanium oxides pigments and of the resulting properties. The wetting angle measurements show out hydrophobic character of pigments after their treatment. Which is the polymer fraction applied on then surface, the homogeneity of covering and the character of bonds formed by the polymer with the surface? An almost complete polymer deposit is observed by thermogravimetry and by infrared spectroscopy which can be partly removed by a solvent as a function of surface oxide. A small part of the polymer remains on alumina, a larger part on titanium oxide and is fixed on the various iron oxide pigments. Chemical bonds are observed by infrared spectroscopy thanks to quantum mechanics attributions. The surface treatment is inhomogeneous on the surface, as shown by AFM and XPS, with the aspect of small islands of polymer. AFM direct observation on alumina is decisive for the discussion. Each island results from a statistic coil conformation of the polymer chains. The inhomogeneous covering is inherent on entropic contribution on energy of polymer chains which inhibit a planar covering of molecules on the oxide surfaces. The use of shorter molecules or in-situ polymerization should be favored.
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Mechanics. École Nationale Supérieure des Mines de Paris, 2007. French. <NNT : 2006ENMP1456>


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Submitted on : Monday, October 22, 2007 - 10:32:13 AM
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Mariane Bohic. Caractérisation de la surface de pigments traités par des polyesters acryliques. Mechanics. École Nationale Supérieure des Mines de Paris, 2007. French. <NNT : 2006ENMP1456>. <tel-00180831>

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