Dielectric and mechanical behaviour of polyurethane networks from poly(oxypropylene)diols or-triols and diisocyanate View Full Text


Ontology type: schema:ScholarlyArticle     


Article Info

DATE

1996-02

AUTHORS

J. Nedbal, J. Fähnrich, H. Valentová, M. Ilavský, Z. Bubeníková

ABSTRACT

Thermally stimulated depolarization currents and dielectric and dynamic mechanical behaviour of polyurethane networks prepared from poly(oxypropylene)diols or-triols and 4,4-diphenylmethane diisocyanate were studied. While the frequency and temperature positions of mechanical and dielectric functions are predominantly determined by the concentration of polar urethane groups in the network chain, the equilibrium modulus correlates with network chain length. The effect of the chain polarity on the shape of loss permittivity vs. frequency curves is more pronounced in the low frequency region than in the high frequency one and is practically the same for stoichiometric and off-stoichiometric networks measured earlier. More... »

PAGES

233-239

References to SciGraph publications

Identifiers

URI

http://scigraph.springernature.com/pub.10.1007/bf00294912

DOI

http://dx.doi.org/10.1007/bf00294912

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1011197329


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