INVESTIGADORES
ALVAREZ Vera Alejandra
artículos
Título:
Viscoelastic behaviour of polycaprolactone/clay nanocomposites
Autor/es:
LEANDRO LUDUEÑA; ANALÍA VÁZQUEZ; VERA ALVAREZ
Revista:
JOURNAL OF COMPOSITE MATERIALS
Editorial:
SAGE PUBLICATIONS LTD
Referencias:
Año: 2011
ISSN:
0021-9983
Resumen:
The creep behavior of polycaprolactone and polycaprolactone/clay nanocomposites prepared by melt intercalation was
studied. Sodium montmorillonite and organo-modified montmorillonite were used as reinforcement in order to analyze
the effect of clay dispersion degree. Both a viscoelastic creep model named Burgers (four parameters) and an empirical
method called Findley power law were applied to fit the experimental data (elastic, primary creep stage, and secondary
creep stages). An additional effort was conducted to relate the parameter analysis of the Burgers model with the
experimental behavior at each creep stage. The variation of the theoretical parameters illustrated the influence of the
nanofillers on the experimental creep performance of the bulk matrix. Timetemperature superposition principle was
used to predict the long-term behavior based on the short-term experimental data. The Findley power law model was
also employed to reproduce the master curves. Both experimental curves and models demonstrated that the incorporation
of the clay produces a significant improvement on the creep resistance at short times. This effect was higher for
the best-dispersed nanocomposite. The latter result was strictly related to the great enhancement of the elastic behavior
since in that case the time-dependent deformations were higher than those of the neat matrix.