Thermal and dielectric properties of polycarbonatediol polyurethane

ABSTRACT The dielectric relaxation behavior of segmented polyurethane has been studied using Broad‐Band Dielectric Spectroscopy in the frequency domain, 10−2 to 108 Hz, and in the temperature range of −120 to 140°C. The spectra show three secondary processes (δ, γ, and β) followed by the α relaxatio...

Full description

Saved in:
Bibliographic Details
Published in:Journal of applied polymer science 2015-06, Vol.132 (22), p.np-n/a
Main Authors: Ortiz-Serna, Pilar, Carsí, Marta, Redondo-Foj, Belén, Sanchis, María Jesús, Culebras, Mario, Gómez, Clara María, Cantarero, Andrés
Format: Article
Language:English
Subjects:
Carbonates
Chains
dielectric properties
Dielectric relaxation
Dielectrics
Materials science
Mathematical analysis
Polarization
Polymers
Polyurethane resins
polyurethanes
Spectra
Spectroscopy
structure-property relations
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:ABSTRACT The dielectric relaxation behavior of segmented polyurethane has been studied using Broad‐Band Dielectric Spectroscopy in the frequency domain, 10−2 to 108 Hz, and in the temperature range of −120 to 140°C. The spectra show three secondary processes (δ, γ, and β) followed by the α relaxation and conductive processes. The Havriliak‐Negami (HN) phenomenological equation was used in order to characterize all the processes. The δ, γ, and β relaxations are probably associated with (i) local motions of the main chain (ii) motions of the carbonate group in the soft phase and (iii) reorientational motions of water molecules. The microphase separated morphology associated with soft and hard domains is reflected in the dielectric spectra, at high temperatures, by the presence of the Maxwell‐Wagner‐Sillars (MWS) interfacial polarization process. © 2015 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015, 132, 42007.
ISSN:0021-8995
1097-4628
DOI:10.1002/app.42007