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Electrical and dielectric properties of new polyurethane ionomers

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dc.contributor.author Polizos, G en
dc.contributor.author Kyritsis, A en
dc.contributor.author Pissis, P en
dc.contributor.author Shilov, VV en
dc.contributor.author Shevchenko, VV en
dc.date.accessioned 2014-03-01T01:14:34Z
dc.date.available 2014-03-01T01:14:34Z
dc.date.issued 1999 en
dc.identifier.uri https://dspace.lib.ntua.gr/xmlui/handle/123456789/13149
dc.subject Dielectric Properties en
dc.subject Differential Scanning Calorimetry en
dc.subject Ionic Conductivity en
dc.subject Molecular Structure en
dc.subject Small Angle X Ray Scattering en
dc.subject Poly Ethylene Oxide en
dc.subject.other Amorphous materials en
dc.subject.other Crystallization en
dc.subject.other Dielectric properties of solids en
dc.subject.other Differential scanning calorimetry en
dc.subject.other Ionic conduction en
dc.subject.other Ions en
dc.subject.other Molecular structure en
dc.subject.other Morphology en
dc.subject.other Polyethylene oxides en
dc.subject.other Polyurethanes en
dc.subject.other Protons en
dc.subject.other X ray scattering en
dc.subject.other Amorphous polyurethanes en
dc.subject.other Microphase separated structure en
dc.subject.other Nonionic hard segments en
dc.subject.other Small angle X ray scattering en
dc.subject.other Ionomers en
dc.title Electrical and dielectric properties of new polyurethane ionomers en
heal.type journalArticle en
heal.identifier.primary 10.1109/ISE.1999.832052 en
heal.identifier.secondary http://dx.doi.org/10.1109/ISE.1999.832052 en
heal.publicationDate 1999 en
heal.abstract Ionomers are polymers which contain charge groups in their molecular structure. Here we report the electrical and dielectric properties of new polyurethane ionomers based on poly(ethylene oxide) with nonionic hard segments of varying length and flexible segments containing alkali ions (Li+, Na+, K+) or protons (H+) by means of TSDC-DRS. Differential scanning calorimetry (DSC) and small-angle X-ray scattering (SAXS) were employed for structural investigation. The combined results by the different techniques indicate the coexistence of two morphologies: the microphase-separated structure characteristic of polyurethanes (hard-segment-rich microdomains in a soft-segment-rich matrix) and ionic aggregates (multiplets and clusters). Crystallization is observed at low hard segment contents (melting at about 305 K), the tendency for crystallization increasing upon hard segment extension and decreasing upon neutralization. Values of ionic conductivity are in the range of 10-4 S/m at 323 K, the conductivity in the amorphous polyurethanes being governed by the motion of the polymeric chains. en
heal.publisher IEEE, Piscataway, NJ, United States en
heal.journalName Proceedings - International Symposium on Electrets en
dc.identifier.doi 10.1109/ISE.1999.832052 en
dc.identifier.spage 321 en
dc.identifier.epage 324 en


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