Preparation and characterisation of epoxy/alumina polymer nanocomposites
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The effect of adding nanosized alumina fillers of both fibre-like and spherical shapes to an epoxy polymer has been investigated. The alumina was dispersed in the epoxy hardener using two different sonication techniques. A high degree of dispersion was difficult to obtain and agglomerates were observed in the nanocomposites. Nevertheless, particle size analysis showed an effect of the sonication technique, resulting in a higher degree of dispersion. Mechanical testing and dynamic mechanical analysis revealed that the stiffness of the epoxy polymer could be significantly improved using only small amounts of alumina, even when a significant part of the filler was in an agglomerated state. Also, the experimental results from tensile testing agreed well with mathematical models at low filler concentrations.
Johnsen, Bernt Brønmo; Frømyr, Tomas Roll; Thorvaldsen, Tom; Olsen, Torbjørn. Preparation and characterisation of epoxy/alumina polymer nanocomposites. Composite interfaces (Print) 2013 ;Volum 20.(9) s. 721-740