Effect of polyol excess on the electrical property of vegetable-polyurethane film

dc.creatorKANDA, D. H. F.
dc.creatorNAGASHIMA, H. N.
dc.creatorMALMONGE, J. A.
dc.creatorSAKAMOTO, W. K.
dc.creatorCHIERICE, G. O.
dc.date.accessioned2012-10-20T05:33:31Z
dc.date.accessioned2018-07-04T15:51:34Z
dc.date.available2012-10-20T05:33:31Z
dc.date.available2018-07-04T15:51:34Z
dc.date.created2012-10-20T05:33:31Z
dc.date.issued2008
dc.identifierJOURNAL OF MATERIALS SCIENCE, v.43, n.16, p.5436-5440, 2008
dc.identifier0022-2461
dc.identifierhttp://producao.usp.br/handle/BDPI/31740
dc.identifier10.1007/s10853-008-2843-3
dc.identifierhttp://dx.doi.org/10.1007/s10853-008-2843-3
dc.identifier.urihttp://repositorioslatinoamericanos.uchile.cl/handle/2250/1628378
dc.description.abstractFreestanding castor oil-based polyurethane (PU) film was obtained using spin-coating method. The effect of polyol content was analysed by means of thermally stimulated depolarisation current and AC dielectric measurements techniques. Two relaxation peaks were observed in the temperature range of -40 to 60 degrees C for PU with different polyol contents. The presence of polyol excess provides a shift to lower temperature of the a relaxation and the decrease in the activation energy of the transition in this region might be attributed to the plasticising effect of the polyol. The peak at higher temperature is due to the Maxwell-Wagner-Sillars relaxation, which also shifts in the low temperature direction as the polyol content is increased.
dc.languageeng
dc.publisherSPRINGER
dc.relationJournal of Materials Science
dc.rightsCopyright SPRINGER
dc.rightsrestrictedAccess
dc.titleEffect of polyol excess on the electrical property of vegetable-polyurethane film
dc.typeArtículos de revistas


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