Siloxanes from the hydrolysis of isopropyltrimethoxysilane

Crandall, Jack K.; Morel-Fourrier, Christophe

doi:10.1016/0022-328x(94)05159-9

Cited by 20 publications

(52 citation statements)

References 22 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Before the data collection, all the T 1 measurements were done with the inversion-recovery The kinetic studies were carried out in situ at 258C in NMR tubes. The hydrolysis and condensation reactions of MRPS and MPS were carried out in a mixture of ethanol-d6 and deuterated water CD 3 CD 2 OD/D 2 O: 80/20 (w/w) at a concentration of 10% w/w and followed in situ at 258C, by recording 1 H, 13 C, and 29 Si NMR spectra. For alkaline conditions, TEA (2%, w/w versus solvents) was added to D 2 O, whereas for acidic conditions, CD 3 CD 2 OD (5%, w/w with respect to the solvent) was introduced into D 2 O.…”

Section: Nmr Kinetics In Situmentioning

confidence: 99%

“…1 H, 13 C, and 29 Si NMR spectra of the silane solutions were run on a Varian UNITY 400 spectrometer operating at 399.956, 100.572, and 79.455 MHz, respectively. All chemical shifts, relative to TMS, were measured with a coaxial insert tube containing the TMS solution as an external reference.…”

Section: Nmr Kinetics In Situmentioning

confidence: 99%

“…All chemical shifts, relative to TMS, were measured with a coaxial insert tube containing the TMS solution as an external reference. For the 1 H and 13 C NMR, a 5-mm probe was used; the spectral widths were calibrated on the spectra to obtain the best resolution. Common 1D and 2D sequences (HMQC and HMBC) were used for a clear cut establishment of peak assignments (especially in the case of MRPS).…”

Section: Nmr Kinetics In Situmentioning

confidence: 99%

“…However once hydrolyzed, the silanes constitute a rather reactive system, which evolves with time as a result of the condensation of the silanol groups with each other or with the alkoxy groups forming dimeric and oligomeric structures. 1,[13][14][15] This phenomenon handicaps the adsorption of OHbearing substrates, since the concentration of silanol groups can vanish rapidly.…”

Section: Introductionmentioning

confidence: 98%

“…In previous papers, 23,24 we have used 1 H, 13 C, and 29 Si NMR as tools to probe the different species able to be generated in ethanol-water solution and have shown that the hydrolysis of APS and that of gdiethylenetriaminopropyl trimethoxysilane (TAS) were very fast and that the selfcondensation yielded the corresponding oligomeric networks. However, the hydrolysis of MPS was found to be much slower and required the use of an amine as a catalyst to boost the kinetic of hydrolysis.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Adsorption of silane onto cellulose fibers. II. The effect of pH on silane hydrolysis, condensation, and adsorption behavior

Belhassen¹,

Boufi²,

Salon³

et al. 2008

J of Applied Polymer Sci

View full text Add to dashboard Cite

The hydrolysis of four alkoxysilane agents, g-methacryloxypropyl trimethoxysilane (MPS), g-mercaptopropyl trimetoxysilane (MRPS), octyl trimethoxysilane OS), and N-phenyl-g-aminopropyl trimethoxysilane (PAPS), was carried out in an ethanol/water (80/20) solution under both acid and basic conditions. 1 H, 13 C, and 29 Si NMR spectroscopy were used to provide quantitative analyses of the structural components during hydrolysis and condensation reaction. The analysis revealed that the acidcatalyzed hydrolysis of silane allows the formation of high amount of silanol groups, reduced the selfcondensation reaction among silanol groups and stabilized the proportion of intermediary hydrolyzed species for several days. However, under basic condition, condensation reactions proceed as soon as the hydrolysis reaction started leading to the rapid consumption of silanol groups through selfcondensation and to the growth of three-dimensional high molecular structures. The interaction of MPS and MRPS with cellulose fibers and the evolution of their surface properties were then investigated using adsorption isotherms and contact angle measurement.

show abstract

Section: Nmr Kinetics In Situmentioning

confidence: 99%

Section: Nmr Kinetics In Situmentioning

confidence: 99%

Section: Nmr Kinetics In Situmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Adsorption of silane onto cellulose fibers. II. The effect of pH on silane hydrolysis, condensation, and adsorption behavior

Belhassen¹,

Boufi²,

Salon³

et al. 2008

J of Applied Polymer Sci

View full text Add to dashboard Cite

show abstract

Immobilization of Biomolecules at Semiconductor Interfaces

Hamers

2012

Functionalization of Semiconductor Surfaces

View full text Add to dashboard Cite

Optimization of the silane treatment of cellulosic fibers from eucalyptus wood using response surface methodology

Rojo

Alonso

Saz-Orozco

et al. 2015

J of Applied Polymer Sci

View full text Add to dashboard Cite

Viscose cellulosic fibers from eucalyptus wood were treated with organosilanes to introduce specific functionalities on the fibers and enhance their wettability and adhesion with phenolic matrices in composites. Modeling procedures were employed to optimize the conditions of the treatments of the fibers with the silanes (3-aminopropyl) trimethoxysilane (APS) and 3-(2-aminoethylamino) propyltrimethoxysilane (AAPS). The analyzed responses were relative intensities of the bands 1565/897 and 1120/897 cm 21 , measured by Fourier transform infrared spectroscopy, and the silicon amount incorporated into the cellulosic fibers, which was determined by energy dispersive X-ray analysis. In addition, surface morphology of the silane treated fibers was observed using scanning electron microscopy. The treatments of the cellulosic fibers with 2.2% APS for 120 min and 1.5% AAPS for 100 min were selected as optimums. According to contact angle measurements, both treatments enhanced the wettability between the fibers and a resol-type phenolic resin, revealing the possible use of the silane treated fibers as reinforcement in phenolic composites. V C 2015 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015, 132, 42157.

show abstract

Siloxanes from the hydrolysis of isopropyltrimethoxysilane

Cited by 20 publications

References 22 publications

Adsorption of silane onto cellulose fibers. II. The effect of pH on silane hydrolysis, condensation, and adsorption behavior

Adsorption of silane onto cellulose fibers. II. The effect of pH on silane hydrolysis, condensation, and adsorption behavior

Immobilization of Biomolecules at Semiconductor Interfaces

Optimization of the silane treatment of cellulosic fibers from eucalyptus wood using response surface methodology

Contact Info

Product

Resources

About