Qualitative and semiquantitative determination of the atomic and molecular tungsten distributions in hybrid hydroxyurethanes???poly(dimethylsiloxane) films containing phosphotungstates ([PW12O40]3???)

dc.creatorYSNAGA, ORLANDO E.
dc.creatorAGUIAR, KELEN M.F.R. de
dc.creatorZAMBONI, CIBELE B.
dc.creatorPOLITO, WAGNER L.
dc.creatorRODRIGUES-FILHO, UBIRAJARA P.
dc.date2020
dc.date2020-12-07T12:47:16Z
dc.date2020-12-07T12:47:16Z
dc.date.accessioned2023-09-28T14:17:00Z
dc.date.available2023-09-28T14:17:00Z
dc.identifier0003-7028
dc.identifierhttp://200.136.52.105/handle/123456789/31591
dc.identifier12
dc.identifier74
dc.identifier10.1177/0003702820945018
dc.identifier54.28
dc.identifier70.00
dc.identifier.urihttps://repositorioslatinoamericanos.uchile.cl/handle/2250/9001814
dc.descriptionIn this study, hybrid poly(dimethylsiloxane)-derived hydroxyurethanes films (PDMSUr-PWA) containing phosphotungstic acid (H3PW12O40/PWA) were characterized using field emission gun scanning electron microscopy (FEG-SEM), in attenuated total reflectance Fourier transform mid-infrared mode (ATR FT-MIR), and analyzed using synchrotron radiation micro-X-ray fluorescence (SR-mXRF), synchrotron radiation grazing incidence X-ray fluorescence (SR-GIXRF), laserinduced breakdown spectroscopy (LIBS), and instrumental neutron activation analysis (NAA) in order to correlate the distribution patterns of tungsten and properties of PDMSUr-PWA films. PDMS constitute elastomers with good mechanical, thermal, and chemical (hydrophobicity/non-hygroscopy) resistance. Currently, products based on urethanes (e.g., polyurethanes) are widely used in many applications as plastics, fiber-reinforced polymers, high-performance adhesives, corrosion-resistant coatings, photochromic films, among others. The possibility to combine inorganic and organic components can produce a hybrid material with unique properties. PWA has an important role as agent against the corrosion of steel surfaces in different media, besides exhibiting amazing catalytic and photochromic properties in these films. PWA kept its structure inside of these hybrid films through interactions between the organic matrix of PDMSUr and silanol from the inorganic part (organically modified silica), as was shown using ATR FT-MIR spectra. The FEG-SEM/SR-mXRF/wideangle X-ray scattering (WAXS)/X-ray diffraction (XRD)/energy dispersive X-ray results proved the presence of PWA in the composition of domains of PDMSUr-PWA films. At PWA concentrations higher than 50 wt%/wt, tungsten segregation across the thickness is predominant, while that at PWA concentrations lower than 35 wt%/wt, tungsten segregation at surface is predominant. Inhomogeneities in the tungsten distribution patterns (at micrometric and millimetric level) may play an important role in the mechanical properties of these films (elastic modulus and hardness).
dc.descriptionFunda????o de Amparo ?? Pesquisa do Estado de S??o Paulo (FAPESP)
dc.descriptionConselho Nacional de Desenvolvimento Cient??fico e Tecnol??gico (CNPq)
dc.descriptionFAPESP: 11/08120-0; 11/06019-0; 13/05279-3
dc.descriptionCNPq: 141880/2011-2; 160515/2011-4
dc.format1515-1529
dc.relationApplied Spectroscopy
dc.rightsopenAccess
dc.subjecthydroxy compounds
dc.subjecthybridization
dc.subjectfilms
dc.subjectsynchrotron radiation
dc.subjectneutron activation analysis
dc.subjectspectroscopy
dc.subjectbreakdown
dc.subjectlaser spectroscopy
dc.subjectx-ray fluorescence analysis
dc.subjectx-ray sources
dc.titleQualitative and semiquantitative determination of the atomic and molecular tungsten distributions in hybrid hydroxyurethanes???poly(dimethylsiloxane) films containing phosphotungstates ([PW12O40]3???)
dc.typeArtigo de peri??dico
dc.coverageI


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