Nanoscale Structure Of Urethane/urea Elastomeric Films

dc.creatorReis
dc.creatorDennys; Trindade
dc.creatorAna C.; Godinho
dc.creatorMaria Helena; Silva
dc.creatorLaura C.; Goncalves
dc.creatorMaria do Carmo; Figueiredo Neto
dc.creatorAntonio M.
dc.date2017
dc.datefev
dc.date2017-11-13T13:56:08Z
dc.date2017-11-13T13:56:08Z
dc.date.accessioned2018-03-29T06:09:37Z
dc.date.available2018-03-29T06:09:37Z
dc.identifierBrazilian Journal Of Physics. Springer, v. 47, p. 19 - 25, 2017.
dc.identifier0103-9733
dc.identifier1678-4448
dc.identifierWOS:000392227400003
dc.identifier10.1007/s13538-016-0468-6
dc.identifierhttps://link-springer-com.ez88.periodicos.capes.gov.br/article/10.1007/s13538-016-0468-6
dc.identifierhttp://repositorio.unicamp.br/jspui/handle/REPOSIP/329819
dc.identifier.urihttp://repositorioslatinoamericanos.uchile.cl/handle/2250/1366844
dc.descriptionThe nanostructure of urethane/urea elastomeric membranes was investigated by small-angle X-ray scattering (SAXS) in order to establish relationships between their structure and mechanical properties. The networks were made up of polypropylene oxide (PPO) and polybutadiene (PB) segments. The structural differences were investigated in two types of membranes with the same composition but with different thermal treatment after casting. Type I was cured at 70-80 A degrees C and type II at 20 A degrees C. Both membranes showed similar phase separation by TEM, with nanodomains rich in PB or PPO and 25 nm dimensions. The main difference between type I and type II membranes was found by SAXS. The type I membrane spectra showed, besides a broad band at a 27-nm q value (modulus of the scattering vector), an extra band at 6 nm, which was not observed in the type II membrane. The SAXS spectra were interpreted in terms of PPO, PB soft segments, and urethane/urea links, as well as hard moiety segregation in the reaction medium. This additional segregation (q = 7 nm), although subtle, results in diverse mechanical behavior of in both membranes.
dc.description47
dc.description1
dc.description19
dc.description25
dc.descriptionPortuguese Science and Technology Foundation [SFRH/BPD/64330/2009]
dc.descriptionFCT-Portuguese Foundation for Science and Technology [UID/CTM/50025/2013]
dc.languageEnglish
dc.publisherSpringer
dc.publisherNew York
dc.relationBrazilian Journal of Physics
dc.rightsfechado
dc.sourceWOS
dc.subjectElastomer
dc.subjectSaxs
dc.subjectUrethane/urea
dc.subjectStructure
dc.titleNanoscale Structure Of Urethane/urea Elastomeric Films
dc.typeArtículos de revistas


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