INVESTIGADORES
FONTICELLI Mariano Hernan
artículos
Título:
Redox Potential Distribution in the Presence of Mechanical Stress. The Case of Electroactive Polymers
Autor/es:
D. POSADAS; M. H. FONTICELLI; M. J. RODRIGUEZ PRESA; M. I. FLORIT
Revista:
JOURNAL OF PHYSICAL CHEMISTRY B
Referencias:
Año: 2001 vol. 105 p. 2291 - 2296
ISSN:
1089-5647
Resumen:
The current/potential response during the redox switching of electroactive polymers derived from substituted
arylamines is analyzed in terms of a sigmoidal distribution of apparent formal potentials. This kind of polymers
shows expansion and contraction during the redox switching. A thermodynamic analysis of these systems,
including mechanical stresses developed during the oxidation and reduction cycles, leads to a distribution of
apparent formal potentials. It is shown that the concept of electron binding can be applied to describe the
redox switching of an electroactive polymer. On the basis of this concept, simple statistical thermodynamic
models can be applied to describe the distribution of apparent formal potentials during the redox switching
of this kind of polymers. In particular, a simple model based on the mean field approximation, including
interaction between near neighbors, leads to a linear distribution of the apparent formal potential. On the
other hand, a statistical thermodynamical model, including the development of strains during the redox
switching, successfully describes the experimental sigmoidal distribution of apparent formal potentials.