2026-04-13T02:09:20Zhttps://recercat.cat/oai/request

oai:recercat.cat:2117/273132026-02-01T07:23:04Zcom_2072_1033col_2072_452950

00925njm 22002777a 4500 dc Díaz Andrade, Angélica María author Franco García, María Lourdes author Casas Becerra, María Teresa author Valle Mendoza, Luis Javier del author Aymami Bofarull, Juan author Olmo Osuna, Cristian author Puiggalí Bellalta, Jordi author 2014-10-15 Ultrasound micro-molding technology has been tested as a new method to get polymer/clay nanocomposites. Biodegradable polylactide (PLA) and poly (nona-methylene azelate) (PE99) have been used as polymer matrices, whereas different silicate clays have been assayed. The new technology is able to get specimens without evidences of degradation during processing. Only the use of organo-modified clays could give rise to a slight molecular weight decrease when the poly (alkylene dicarboxylate) sample was considered. Ultrasonic micro-molding has revealed effective to get directly nanocomposites with the final form required for a selected application, a homogeneous clay distribution up to a load of 6 wt-% and more interestingly exfoliated structures without being necessary the use of a compatibilizer agent between the organic polymer and the inorganic silicate clay. Transmission electron micrographs and X-ray diffraction profiles revealed exfoliated structure when N757, C20A, C25A, and N848 clays were employed.; Crystallization behavior of exfoliated PLA nanocomposites was highly peculiar since clay particles had an antinucleating effect that decreased the overall crystallization rate respect to the neat polymer. In addition, the incorporation of layers into growing spherulites increased the crystal growth rate. A typical crystallization effect was on the contrary observed for nanocomposites derived from the poly (alkylene dicarboxylate) sample. Peer Reviewed Postprint (published version) Àrees temàtiques de la UPC::Enginyeria química Ultrasound micro-molding technology Nanocomposites Exfoliated structures Polylactide Poly (alkylene dicarboxylate) Crystallization kinetics POLYLACTIDE/LAYERED SILICATE NANOCOMPOSITE CRYSTALLIZATION BEHAVIOR THERMAL-DEGRADATION MORPHOLOGY CONFORMATION POLYSTYRENE SCAFFOLDS MIXTURES ACID) Ultrasons Nanocompòsits (Materials) Preparation of micro-molded exfoliated clay nanocomposites by means of ultrasonic technology