Thermal, rheological, and barrier properties of waterborne acrylic nanocomposite coatings based on boehmite or organo-modified montmorillonite |
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| Authors: | Giulio Malucelli Jenny Alongi Emilia Gioffredi Massimo Lazzari |
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| Institution: | 1. Dipartimento di Scienza Applicata e Tecnologia, Politecnico di Torino, Alessandria Branch, Viale T. Michel 5, 15121, Alessandria, Italy
2. Center for Research in Biological Chemistry and Molecular Materials, Campus Vida, University of Santiago de Compostela, 15782, Santiago de Compostela, Spain
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| Abstract: | An organo-modified montmorillonite (Cloisite®30B) or an unmodified boehmite (Disperal®40) have been added to two acrylic latex dispersions (one of them UV-curable) for obtaining nanocomposite coatings. X-ray diffraction and transmission electron microscopy show a high degree of exfoliation in the nanocoatings based on montmorillonite, together with the deagglomeration of the micrometer-sized boehmite powder and the presence of single boehmite crystallites within the polymer matrix. Such morphologies are found to enhance the thermal and thermo-oxidative stability of the latexes and to significantly decrease their oxygen permeability, as well. |
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