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Preparation of micro-molded exfoliated clay nanocomposites by means of ultrasonic technology
Díaz Andrade, Angélica María; Franco García, María Lourdes; Casas Becerra, María Teresa; Valle Mendoza, Luis Javier del; Aymami Bofarull, Juan; Olmo Osuna, Cristian; Puiggalí Bellalta, Jordi
Universitat Politècnica de Catalunya. Departament d'Enginyeria Química; Universitat Politècnica de Catalunya. PSEP - Polimers Sintètics: Estructura i Propietats. Polimers Biodegradables.; Universitat Politècnica de Catalunya. MACROM - Cristal·lografia, Estructura i Funció de Macromolècules Biològiques
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
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)
Attribution-NonCommercial-NoDerivs 3.0 Spain
http://creativecommons.org/licenses/by-nc-nd/3.0/es/
info:eu-repo/semantics/publishedVersion
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