Depolarization currents from some polyesters and polyurethanes

Author

Diaconu, I. ; Ciobanu, C. ; Simionescu, C.I.

Author_Institution

Inst. of Macromolecular Chem. ´´P. Poni´´, Jassy, Romania

fYear

1991

fDate

25-27 Sep 1991

Firstpage

629

Lastpage

633

Abstract

Thermally stimulated depolarization currents from some polyesters (PS) and corresponding polyurethanes (PU) based on those polyesters were studied in the range of 230-480 K. Two and four or five relaxation processes were detected in PS and PU, respectively. The location and intensity of the relaxation peaks are dependent on the chemical structure of the PS. The relaxations in PS were associated with glass transition and melting processes. Additional relaxations observed in PU were related to the Maxwell-Wagner polarization and to the secondary thermal transition of microphases with various hard segment concentrations

Keywords

dielectric polarisation; dielectric relaxation; glass transition (polymers); melting; polymers; thermally stimulated currents; 230 to 480 K; Maxwell-Wagner polarization; chemical structure; glass transition; hard segment concentrations; melting processes; microphases; polyesters; polyurethanes; relaxation peaks; relaxation processes; secondary thermal transition; thermally stimulated depolarisation currents; Amorphous materials; Bonding; Chemical processes; Chemistry; Glass; History; Hydrogen; Mechanical factors; Polarization; Temperature distribution;

fLanguage

English

Publisher

ieee

Conference_Titel

Electrets, 1991. (ISE 7) Proceedings., 7th International Symposium on (Cat. No.91CH3029-6)

Conference_Location

Berlin

Print_ISBN

0-7803-0112-9

Type

conf

DOI

10.1109/ISE.1991.167285

Filename

167285