Title :
Hydration properties of PHEA/Kevlar composites studied by dielectric, DSC and sorption isotherm measurements
Author :
Kyritis, A. ; Pissis, P. ; Ribelles, J. L Gomez ; Pradas, M. Monleon
Author_Institution :
Dept. of Phys., Athens Univ., Greece
Abstract :
The authors present a detailed study of the dielectric properties of poly(hydroxyethyl acrylate) (PHEA) and PHEA/Kevlar composites by means of the thermally stimulated depolarization currents (TSDC) method, partial heating, and thermal sampling techniques in a wide range of temperatures and water contents. The measurements make it possible to investigate the influence of moisture on the different relaxation mechanisms and the different binding modes of water. Additional information is obtained from differential scanning calorimetry (DSC) and sorption isotherm measurements
Keywords :
composite materials; dielectric depolarisation; dielectric relaxation; electrets; moisture; polymers; solvation; sorption; thermal analysis; thermally stimulated currents; DSC; PHEA/Kevlar composites; binding modes; dielectric properties; differential scanning calorimetry; electret; hydration properties; moisture; partial heating; poly(hydroxyethyl acrylate); relaxation mechanisms; sorption isotherm measurements; thermal sampling; thermally stimulated depolarization currents; water contents; Calorimetry; Current measurement; Dielectric materials; Dielectric measurements; Laboratories; Physics; Polymers; Temperature distribution; Thermodynamics; Water;
Conference_Titel :
Electrets, 1991. (ISE 7) Proceedings., 7th International Symposium on (Cat. No.91CH3029-6)
Conference_Location :
Berlin
Print_ISBN :
0-7803-0112-9
DOI :
10.1109/ISE.1991.167209
