INTEMA   05428
INSTITUTO DE INVESTIGACIONES EN CIENCIA Y TECNOLOGIA DE MATERIALES
Unidad Ejecutora - UE
congresos y reuniones científicas
Título:
Advanced Materials Based on Dispersions of NPs in Crosslinked Polymers and Blends
Autor/es:
ROBERTO J. J. WILLIAMS; HERNÁN E. ROMEO; CRISTINA E. HOPPE
Lugar:
San Sebastian
Reunión:
Simposio; XI European Symposium on Polymer Blends; 2012
Institución organizadora:
Grupo de Investigación "Materiales + Tecnologías" y el Instituto Polymat, ambos pertenecientes a la UPV/EHU
Resumen:
Nanocomposites based on the dispersion and self-assembly of nanoparticles (NPs) in crosslinked polymers and blends are used to improve physical properties of the matrix or to create new functional properties such as electrical conductivity, antimicrobial activity, fluorescence or near-infrared optical resonances. In this lecture several examples of self-assembly of NPs in crosslinked polymers will be discussed. A dispersion of crystalline POSS (polyhedral oligomeric silsesquioxane) platelets in an epoxy matrix was generated by a crystallization-induced phase separation process. POSS platelets could act in a similar way as nanoclays dispersed in polymers to reduce the permeability of gases and vapors through the increase in the tortuosity of the diffusion path. The advantage is the in situ generation of the platelets that avoids agglomeration problems present in the processing of conventional nanoclays dispersions. A polymerization-induced phase separation of a solution of polystyrene (PS) and gold NPs in epoxy monomers produced the preferential location and self-assembly of NPs inside the PS phase. This gives the possibility of controlling their macroscopic dispersion in the polymer blend. Silver nanowires (NWs) were self-assembled in a macroporous physical gel produced by cooling dispersions of the NWs in polyvinylalcohol (PVA) aqueous solutions, by a process called ISISA (ice-segregation induced self-assembly). Several applications of the resulting nanocomposites may be envisaged.