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Impedance spectroscopy of polymer electrolytes based on epoxidized natural rubber with 50 mol% epoxide content
Author(s) -
Chan Chin Han,
Kammer HansWerner
Publication year - 2015
Publication title -
polymer engineering and science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.503
H-Index - 111
eISSN - 1548-2634
pISSN - 0032-3888
DOI - 10.1002/pen.24111
Subject(s) - materials science , electrical resistivity and conductivity , dielectric , electrolyte , natural rubber , lithium perchlorate , dielectric spectroscopy , glass transition , polymer , relaxation (psychology) , polarization (electrochemistry) , electrical impedance , analytical chemistry (journal) , polymer chemistry , composite material , chemistry , electrode , organic chemistry , electrochemistry , optoelectronics , electrical engineering , engineering , psychology , social psychology
Polymer electrolytes of epoxidized natural rubber with 50 mol% epoxide content (ENR‐50) and lithium perchlorate (LiClO 4 ) were studied with respect to variation of thermal and electric properties with salt content. Below salt content of 5% and above 12%, glass transition temperature stays constant. A steep increase is observed in between. Frequency dependence of impedance was studied over a wide range of salt concentration. Complex impedance plots exhibit one semicircle. Location of semicircles above 12% clearly points towards phase heterogeneity. Analysis of resistivity leads to the result that one phase's resistivity corresponds to salt content of 12%, whereas the second phase exceeds this resistivity by one order of magnitude. Imaginary part of impedance supports this behavior with respect to resistivity. Polarization relaxation time, however, does not change with salt content. It demonstrates that the phase with the excess resistivity does not contribute to polarization relaxation. Therefore, universal dielectric behavior can be observed also in the heterogeneous system. POLYM. ENG. SCI., 55:2250–2255, 2015. © 2015 Society of Plastics Engineers