INTEMA   05428
INSTITUTO DE INVESTIGACIONES EN CIENCIA Y TECNOLOGIA DE MATERIALES
Unidad Ejecutora - UE
congresos y reuniones científicas
Título:
Películas Nanoestructuradas Termorreversibles
Autor/es:
J. PUIG; C. E. HOPPE; R. J. J. WILLIAMS
Lugar:
Buenos Aires
Reunión:
Simposio; X Simposio Argentino de Polímeros; 2013
Resumen:
Stable dispersions of paraffin crystallites in an acrylic host were obtained by bulk free-radical polymerization of dodecyl methacrylate blends. At curing temperature, liquid paraffin swelled the polymer forming a homogeneous blend, but phase separated and crystallized below its melting temperature giving place to a heterogeneous material formed by tiny crystallites distributed in a continuous polymer matrix. This phase separation/crystallization process was completely reversible and occurred accompanied by a decrease in optical transmittance that depended on the initial paraffin content. Optical and morphological changes were observed by changing cooling rate and/or composition of the initial sample but not with the number of heating-cooling cycles. This high morphology stability and absence of leaking could be explained by the presence of ordered hydrophobic nanodomains, formed by the self-assembling of pendent alkyl chains of poly(dodecyl methacrylate) (PDMA), that could be acting as efficient stabilization points of the eicosane crystallites.