INVESTIGADORES
MOSIEWICKI Mirna Alejandra
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; Internacional Conference on Science and Technology of Composite Materials, COMAT2007; 2007
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%.