Properties of urethane elastomers—III. Depolarization currents from unsaturated polyurethanes based on 4,4′-diphenylmethane diisocyanate

The dielectric relaxation processes in polyurethanes based on 4,4′-diphenylmethane diisocyanate (MDI) and both saturated and unsaturated polyesters were studied in the range 240–410 K using thermally stimulated depolarization currents method (TSDC). The structure of the TSDC spectra and the location...

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Bibliographic Details
Published in:European polymer journal 1990, Vol.26 (5), p.571-573
Main Authors: Diaconu, I., Ciobanu, C., Simionescu, Cr.I.
Format: Article
Language:English
Subjects:
Applied sciences
Exact sciences and technology
Organic polymers
Physicochemistry of polymers
Properties and characterization
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Summary:The dielectric relaxation processes in polyurethanes based on 4,4′-diphenylmethane diisocyanate (MDI) and both saturated and unsaturated polyesters were studied in the range 240–410 K using thermally stimulated depolarization currents method (TSDC). The structure of the TSDC spectra and the location and intensity of the constituent peaks depend both on the urethane content and thermal history of the polymer. The relaxation processes have been associated with the molecular motions within domains with distinct hard segment concentrations.
ISSN:0014-3057
1873-1945
DOI:10.1016/0014-3057(90)90211-L