Cation coordination in mono-urethanesil hybrids doped with sodium triflate

Gonçalves, M. C.; Bermúdez, V. de Zea; Ostrovskii, Denis; Carlos, Luı́s D.

doi:10.1016/s0013-4686(03)00175-0

Cited by 13 publications

(14 citation statements)

References 39 publications

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“…TMS was used as an internal standard for all liquid NMR measurements (δ TMS ¼ 0 ppm, for 1 H, 13 C and 29 Si). 29 Si NMR spectra were recorded at 25°C on a Varian Unity INOVA 300 MHz Upgrade spectrometer equipped with a 5 mm 1H/19F/X PFG ATB Broadband Probe.…”

Section: Instrumentalmentioning

confidence: 99%

“…methyltriethoxysilane [21] and bis end-capped trialkoxysilyl functionalized poly (propylenglycol) di-ureasil [22], we established the assignation of the ATR bands, which enables using ATR IR spectroscopy to follow the evolution of structural changes during the course of solvolysis and condensation. The studies of de Zea Bermudez et al on ureasils [12,[17][18][19] and urethanesils [13][14][15], and Coleman et al [29,30] and Lee et al [31] on spectral regions of stretching N-H and amide bands were also used. Details on the assigned bands are disclosed in Supplementary section.…”

Section: Gelation Of Peocs With Glacial Acetic Acidmentioning

confidence: 99%

“…Since investigations of PEO-based electrolytes also revealed its tendency to crystallize, poor mechanical properties, low processability, highly hygroscopic nature, ion pairing and salting-out effect at high salt concentrations, a synthesis of organic-inorganic hybrid sol-gel materials, i.e. ormolytes, was proposed to overcome these problems [2,[11][12][13][14][15][16][17][18][19].…”

Section: Introductionmentioning

confidence: 99%

“…A similar precursor based on an urethane bond (-NH-CO-O-), but with single end-capped functionalization, was also investigated, indicating that the nature of incorporated cations significantly influences the type of interactions in the composite material. For example, Na þ cations preferentially interact with the triflate anions, while more polarizing Eu 3 þ cation showed larger affinity to carbonyl oxygens [13]. Di-urethanesil precursors, on the other hand, were reported for production of the composite materials for optics, containing Eu 3 þ [14] or Nd 3 þ [15].…”

Section: Introductionmentioning

confidence: 99%

“…There is a great resemblance between the ureasils characterized by an -NH-CO-NH-urea bond [12,[17][18][19] and urethanes characterized by an -NH-CO-O-carbamate or urethane bond [13][14][15]. The urethanes are composed of low glass transition segments (polyethers in PEOCS) and more polar urethane parts.…”

Section: Introductionmentioning

confidence: 99%

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Structural investigation of ormolytes for EC devices: IR spectroscopic characterization and relation between viscoelastic properties, conductivity and optical modulation

Hajzeri

Perše

Koželj

et al. 2015

Solar Energy Materials and Solar Cells

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Section: Instrumentalmentioning

confidence: 99%

Section: Gelation Of Peocs With Glacial Acetic Acidmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Structural investigation of ormolytes for EC devices: IR spectroscopic characterization and relation between viscoelastic properties, conductivity and optical modulation

Hajzeri

Perše

Koželj

et al. 2015

Solar Energy Materials and Solar Cells

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Polyurethane doped with low‐concentration erbium

Ciobanu¹,

Stoica²,

Cascaval³

et al. 2006

J of Applied Polymer Sci

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Polyurethane (PU) with lactate structures in its conformation can be used as a biological and biodegradable polymer. Polyurethane lactate (PUL) was doped with small quantities of an erbium (Er 3þ ) complex, which hindered the N¼ ¼N group. 2,2 0 -Dihydroxyazobenzene was used as a ligand for the Er 3þ complex. PUL in the presence of the used Er 3þ complex caused water from the complex to be replaced by the polar structures from the polymer. These structures acted as crystallization germs for the structuration of the PU matrix. As a consequence, both the mechanical and thermal properties of the polymer were improved. The sample with the highest mechanical properties contained only 0.064 mmol of Er 3þ complex/g of sample.

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Conductivity modification of proton conducting polymer gel electrolytes with the addition of fumed silica

Sharma

Sekhon

2006

Physica Status Solidi (a)

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The addition of nano size fumed silica to non aqueous proton conducting polymer gel electrolytes containing ammonium hexafluorophosphate (NH4PF6) has been found to modify the conductivity and viscosity behavior. Two maxima observed in the conductivity vs. fumed silica plot at very low concentrations have been explained to be due to an increase in free ion concentration with the dissociation of ion aggregates, and the formation of a high conducting interfacial layer between the particles of fumed silica and polymer gel electrolytes respectively. The change in free ion concentration has been monitored by pH measurements whereas change in mobility has been checked from viscosity measurements. The dissociation of ion aggregates with the addition of fumed silica has also been supported by FTIR results. The variation of conductivity and viscosity with temperature has also been studied and conductivity of nano dispersed gels does not show any change with time. (© 2006 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)

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Cation coordination in mono-urethanesil hybrids doped with sodium triflate

Cited by 13 publications

References 39 publications

Structural investigation of ormolytes for EC devices: IR spectroscopic characterization and relation between viscoelastic properties, conductivity and optical modulation

Structural investigation of ormolytes for EC devices: IR spectroscopic characterization and relation between viscoelastic properties, conductivity and optical modulation

Polyurethane doped with low‐concentration erbium

Conductivity modification of proton conducting polymer gel electrolytes with the addition of fumed silica

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