Structure and properties of Ti4+-ureasil organic-inorganic hybrids

Molina, C.; Dahmouche, K.; Hammer, Peter; Bermúdez, V. de Zea; Carlos, Luı́s D.; Ferrari, Maurizio; Montagna, M.; Gonçalves, Rogéria Rocha; Oliveira, Luiz Fernando Cappa de; Edwards, Howell G. M.; Messaddeqa, Younes; Ribeiro, Sidney J. L.

doi:10.1590/s0103-50532006000300003

Cited by 19 publications

(16 citation statements)

References 8 publications

(11 reference statements)

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“…The structure OSiO resulted from the condensation during the sol–gel process and the structure OSiC came from the coupling agent used in the formulation. The peak at 103.66 eV originated from the interaction between polysiloxane and the pigment particles . Not surprisingly, similar findings were obtained for the AA‐IPA‐HD‐TMP polyurethane hybrid coating.…”

Section: Resultssupporting

confidence: 80%

Effect of pigmentation on polyurethane/polysiloxane hybrid coatings

Gao¹,

Maya-Visuet

He³

et al. 2015

J of Applied Polymer Sci

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Rutile TiO 2 was formulated into polyurethane/polysiloxane hybrid coatings in order to investigate the influence of pigmentation on the inorganic phase of the hybrid coatings. Two urethanes were prepared from the isocyanurate of hexane diisocyanate (HDI), alkoxysilane modified HDI, and tetraethyl orthosilicate (TEOS) oligomers, with oligoesters derived from either cyclohexane diacids (CHDA) and 2-butyl-2-ethyl-1,3-propanediol (BEPD) or adipic acid (AA), isophthalic acid (IPA), 1,6-hexanediol (HD), and trimethylol propane (TMP). The oligoesters were spectroscopically characterized using GPC, FT-IR, and NMR. Chemical interaction between the TiO 2 and the sol-gel precursor was investigated using solid-state 29 Si NMR and XPS. The morphology, mechanical, viscoelastic, thermal properties of the pigmented coatings are evaluated as a function of pigmentation volume concentration (PVC). Using AFM and SEM, the pigment was observed to be well dispersed in the polymer binder. The thermal stability, the tensile modulus, and strength of the coatings were enhanced with increasing PVC, whereas the pull-off adhesion and flexibility (elongation-at-break) were reduced with increasing PVC. Finally, the pigmented coatings were evaluated by electrochemical impedance spectroscopy (EIS) and the results showed that 10 wt % of the pigment improved the corrosion resistance of the entire coating system.

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Section: Resultssupporting

confidence: 80%

Effect of pigmentation on polyurethane/polysiloxane hybrid coatings

Gao¹,

Maya-Visuet

He³

et al. 2015

J of Applied Polymer Sci

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“…For CTS-Si, the peak at $532.8 eV was observed, due to the presence of Si which has a chemically bonded network with oxygen and Si. 20 From the detailed spectrum for Si 2p region, two main chemical states are presented. The presence of peaks at $101.8 eV and $103.4 eV corresponded to C-Si-O and Si-O-Si, Si-OH bonds, respectively.…”

Section: Characterization Of Cts and Cts-simentioning

confidence: 99%

Acceleration of the healing process of full-thickness wounds using hydrophilic chitosan–silica hybrid sponge in a porcine model

et al. 2018

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In this study, we evaluated the surface characterization of a novel chitosan-silica hybridized membrane and highlighted the substantial role of silica in the wound environment. The chemical coupling of chitosan and silica resulted in a more condensed network compared with pure chitosan, which was eventually able to stably maintain its framework, particularly in the wet state. In addition, we closely observed the wound-healing process along with the surface interaction between chitosan-silica and the wound site using large-surface-area wounds in a porcine model. Our evidence indicates that chitosan-silica exerts a synergetic effect of both materials to promote a remarkable wound-healing process. In particular, the silica in chitosan-silica accelerated wound closure including wound contraction, and re-epithelialization via enhancement of cell recruitment, epidermal maturity, neovascularization, and granulation tissue formation compared with pure chitosan and other commercial dressing materials. This advanced wound dressing material may lead to effective treatment for problematic cutaneous wounds and can be further applied for human skin regeneration.

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“…Liquid crystals can be analyzed by SAXS since they are able to disperse the X-rays focused on it. In the SAXS line is used an X-rays detector and an multichannel analyzer to capture the intense of the SAXS measures (I(q)) in function of the modulus of the scattering vector (q) (Glatter and Kratky, 1982;Molina et al, 2006;Koch, 2010).…”

Section: Small Angle X-ray Scattering (Saxs)mentioning

confidence: 99%