DocumentCode
2555839
Title
Dielectric properties of polyurethane block copolymers
Author
Apekis, L. ; Pissis, P. ; Christodoulides, C. ; Spathis, G. ; Kontou, E. ; Kefalas, V.
Author_Institution
Nat. Tech. Univ. of Athens, Greece
fYear
1988
fDate
1-3 Sep 1988
Firstpage
281
Lastpage
285
Abstract
The dielectric behavior of polyurethane block copolymers with various molecular weights and amounts of soft and hard block segments was studied by the thermally stimulated depolarization current (TSDC) method, in the temperature range of 77-370 K. TSDC measurements show a double low-temperature dispersion attributed to γ and β relaxations and a peak at about 240 K, probably due to the glass transition of the amorphous soft phase of the copolymer. A peak also appears between 255 and 270 K, which is related to MWS-type polarization, occurring mainly in the amorphous soft phase
Keywords
glass transition (polymers); polymer blends; polymer structure; thermally stimulated currents; 77 to 300 K; amorphous soft phase; glass transition; molecular weights; polyurethane block copolymers; thermally stimulated depolarization current; Amorphous materials; Dielectric losses; Dielectric measurements; Dispersion; Ducts; Glass; Phase measurement; Physics; Polarization; Temperature distribution;
fLanguage
English
Publisher
ieee
Conference_Titel
Electrets, 1988. (ISE 6) Proceedings., 6th International Symposium on (IEEE Cat. No.88CH2593-2)
Conference_Location
Oxford
Type
conf
DOI
10.1109/ISE.1988.38564
Filename
38564
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