INTEMA   05428
INSTITUTO DE INVESTIGACIONES EN CIENCIA Y TECNOLOGIA DE MATERIALES
Unidad Ejecutora - UE
congresos y reuniones científicas
Título:
Shape Memory Polyurethanes Reinforced With Electrically Conductive Cellulose Crystals
Autor/es:
M. L. AUAD; M. A. MOSIEWICKI; T. RICHARDSON; S. ADANUR; W. J. ORTS; E. S. MEDEIROS; L. H. C. MATTOSO; M. I. ARANGUEN; N. E. MARCOVICH
Lugar:
Rio de Janeiro, Brasil
Reunión:
Conferencia; International Conference on Science and Technology of Composite Materials”, COMAT 2007; 2007
Institución organizadora:
COMAT
Resumen:
During the development of this work, the use of electrically conductive cellulose nanocrystals as reinforcement for shape memory polyurethanes was investigated. They were prepared by growing polyaniline on the surface of cellulose nanofibrils by an in situ polymerization method. These cellulose nanofibers represent a new generation of coated cellulose fibers that can mimic the conductive properties of carbon nanotubes and carbon nanofibres, producing biodegradable reinforcement with outstanding electrical properties. In this work, we optimized the in situ polymerization conditions for the homogeneous deposition of the polyaniline around the cellulose nanofibrils to obtain conductive shape memory polyurethanes. Electrical measurements were performed to characterize the conductive properties of the nanofibers. Remarkably, reinforcement effect was observed in the polyurethane nanocomposites by the addition of cellulose at concentrations as low as 1 wt%. The shape memory behavior was studied and compared with commercial systems. The response was highly repeatable with shape recovery and fixity in the order of 80-85%.