INVESTIGADORES
CYRAS Viviana Paola
congresos y reuniones científicas
Título:
Effect of different organic modifiers on the crystallization kinetics of poly(3-hydroxibutirate) nanocomposites based on modified clays.
Autor/es:
DAVID A. D'AMICO; LILIANA B. MANFREDI; VIVIANA P. CYRAS
Lugar:
Praga
Reunión:
Congreso; 7th MoDeSt Conference 2012; 2012
Institución organizadora:
Chemistry and Academy of Sciences of the Czech Republic.
Resumen:
Preparation
of blends or nanocomposites, using low percentages of inorganic fillers, is among
the routes to improve some of the properties of biodegradable polymers such as
thermal and oxidative barrier, when they are compared with traditional
composites1. There are many factors which limit the use of
nanocomposite based on biodegradable polymers on industrial scale like thermal
stability, humidity absorption and mechanical properties. The polymer properties
depend on the crystallization conditions, and thus the crystallization
kinetics. The introduction of clay plays a significant role in the properties
of polymers, due to the influence of the nanoparticles on their morphology and
crystallization behavior2. So, it is very useful to characterize the
nucleation, crystallization and structural development of PHB in clay
reinforced polymer nanocomposites. This characterization should be used to
optimize the processing conditions for achieving high performance polymer
nanocomposites as well as realize full potential applications of these
materials. For the purpose of describing the evolution of crystallinity under
isothermal or dynamical conditions, a number of mathematical models have been
proposed3, based on the notion of primary nucleation and subsequent
crystal growth mechanisms. In this case, we used the Avrami equation,
Lauritzen?Hoffman model and isoconversional method to analyze the isothermal
results.