Title :
High dielectric constant values in some polyampholytes as observed by thermally stimulated depolarization
Author :
Eve Marchal;Victor Manuel Monroy Soto;Jean-Claude Galin
Author_Institution :
INSTITUT Charles SADRON (CRM-EAHP), CNRS-ULP Strasbourg 6, rue Boussingault, 67083 Strasbourg-Cedex, France
Abstract :
Thermally stimulated depolarization currents of three aromatic and three aliphatic poly(sulphopropylbetaines) are described in the range −190 to +180°C. No particular relaxation common to all six polymers due to the presence of the zwitterionic group is revealed at low temperatures. A peak in the 100–170°C region occurs for all the samples. It is related to a glass transition in two cases. Very high dielectric constant increments, Δε > 100, are obtained for this peak in four cases. For these hygroscopic polymers water acts as a plasticizer for this peak without changing Δε.
Keywords :
"Plastics","Silicon","Temperature measurement","Glass","Dielectric constant","Polymers"
Conference_Titel :
Electrets (ISE 5), 1985 5th International Symposium on
Print_ISBN :
000-0-0000-0000-0
DOI :
10.1109/ISE.1985.7341488