Title :
A detailed TSD-study of the glass transition region of amorphous polymers
Author :
Schrader, Siquard ; Carius, Hans-Eckart
Author_Institution :
Zentralinst. fuer Organische Chemie, Bereich Makromolekulare Verbindungen, Berlin, Germany
Abstract :
The glass-transition region of amorphous polyvinylacetate was investigated by means of thermally stimulated depolarization currents (TSDs). The thermal-sampling (TS) technique was applied to analyze the TSD α-peak in more detail. Structural relaxation which is the origin of physical aging affects the TSD α-peaks and the TS peaks of the glass-transition region strongly. This influence was taken into account by variation of the cooling and heating rates and by variation of annealing time at different temperatures near glass transition. Besides the collective processes of molecular motion, there are relaxation processes connected with local conformational changes which influence the low-temperature tail of the TSD α-peak
Keywords :
dielectric relaxation; electrets; glass transition (polymers); polymers; thermally stimulated currents; amorphous polymers; electret; glass transition region; local conformational changes; low-temperature tail; physical aging; polyvinylacetate; relaxation; relaxation processes; thermally stimulated depolarization currents; Amorphous materials; Circuits; Cooling; Dielectric loss measurement; Electrodes; Glass; Heating; Polarization; Polymers; Temperature sensors;
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.1991.167277
