Title :
Relaxation times distribution in polymers: dielectric and TSDC spectroscopy
Author :
Laredo, E. ; Bello, A. ; Grimau, M.
Author_Institution :
Dept. de Fisica, Univ. Simon Bolivar, Caracas, Venezuela
Abstract :
We present a different approach to obtain the distribution of relaxation times from dielectric spectroscopy (DS) and TSDC recorded current density. The method consists in decomposing the whole relaxation peak into a sum of elementary processes and it is based on the simulated annealing Monte Carlo procedure together with the direct signal analysis. It gives the contribution to the polarization of a set of N relaxation times which cover a chosen interval. The analysis of the DS curves in the frequency or time domain will lead to G(lnτ), while the TSDC analysis gives the N relaxation times whose superposition best reproduce the experimental profile, each of them characterized by a reorientation energy and by a preexponential factor of the Arrhenius or Vogel-Tammann-Fulcher, VTF, temperature dependent relaxation time
Keywords :
Monte Carlo methods; dielectric losses; dielectric relaxation; permittivity; polymer films; thermally stimulated currents; TSDC; current density; dielectric spectroscopy; direct signal analysis; polymers; relaxation times distribution; simulated annealing Monte Carlo procedure; temperature dependent relaxation time; Analytical models; Current density; Dielectrics; Electrochemical impedance spectroscopy; Frequency domain analysis; Monte Carlo methods; Polarization; Polymers; Signal analysis; Simulated annealing;
Conference_Titel :
Electrets, 1999. ISE 10. Proceedings. 10th International Symposium on
Conference_Location :
Athens
Print_ISBN :
0-7803-5025-1
DOI :
10.1109/ISE.1999.832063
