Title :
Dielectric relaxation spectroscopy in polymers: broadband ac-spectroscopy and its compatibility with TSDC
Author_Institution :
II. Phys. Inst., Koln Univ., Germany
Abstract :
Dielectric spectroscopy provides information on molecular dynamics and free charge carriers. While a direct characterization of homogeneous material is possible, the permittivity of blends and mixtures also reflects the microstructure. Intrinsic parameters, such as relaxation time and relaxation strength of a polar component, are only obtained via an effective medium analysis. The superposition of independent relaxation processes can be analyzed in terms of 2-dimensional distributions of relaxation times and activation energies. Dielectric relaxation spectroscopy (DRS) and the measurement of thermally stimulated depolarization currents (TSDC) allow an independent evaluation and test of distribution functions
Keywords :
dielectric relaxation; permittivity; polymer blends; polymers; thermally stimulated currents; 2-dimensional distributions; TSDC; activation energies; blends; broadband AC-spectroscopy; dielectric relaxation spectroscopy; dielectric spectroscopy; direct characterization; distribution functions; effective medium analysis; free charge carriers; homogeneous material; independent relaxation processes; intrinsic parameters; microstructure; mixtures; molecular dynamics; permittivity; polar component; polymers; relaxation strength; relaxation time; thermally stimulated depolarization currents; Charge carriers; Current measurement; Dielectric materials; Dielectric measurements; Electrochemical impedance spectroscopy; Independent component analysis; Microstructure; Permittivity; Polymers; Testing;
Conference_Titel :
Electrets, 1999. ISE 10. Proceedings. 10th International Symposium on
Conference_Location :
Athens
Print_ISBN :
0-7803-5025-1
DOI :
10.1109/ISE.1999.832080
