Título
Tensile piezoresistivity and disruption of percolation in singlewall and multiwall carbon nanotube/polyurethane composites
Autor
FRANCIS AVILES CETINA
Nivel de Acceso
Acceso Abierto
Materias
Resumen o descripción
Carbon nanotube elastomeric composite films were fabricated by solution casting using singlewall
and multiwall carbon nanotubes (SWCNTs and MWCNTs) and two thermoplastic-elastomers polymer
matrices, an in-house synthesized segmented polyurethane and a commercial one. The CNTs are first
characterized and the electrical conductivity, mechanical properties and piezoresistive response of the
SWCNT and MWCNT composites with 8 wt% are evaluated. For both polymer matrices, the electrical
conductivity of composites made from MWCNTs is higher than that achieved for composites made from
SWCNTs. Evaluation of the strain–electrical resistance relationship of the composites shows a dependency
of the piezoresistive sensitivity on the kind of CNT (SWCNT or MWCNT) and matrix electrical and
mechanical properties. Above a specific strain threshold, electrical percolation is disrupted under tensile
loading. The strain level at which this happens is larger for composites made with MWCNTs than for
composites made with SWCNTs.
Fecha de publicación
6 de noviembre de 2013
Tipo de publicación
Artículo
Recurso de información
Formato
application/pdf
Repositorio Orígen
Repositorio Institucional CICY
Descargas
1035