Studies on dialkoxysilane hydrolysis kinetics under alkaline conditions

Jiang, Hongmei; Zheng, Zhen; Xiong, Jiawen; Wang, Xinling

doi:10.1016/j.jnoncrysol.2007.06.036

Cited by 10 publications

(6 citation statements)

References 28 publications

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“…Quantitative 29 Si-{ 1 H} NMR experiments, which used inverse gated decoupling to avoid nuclear Overhauser effects (NOE), were also acquired for selected reaction times (5,9,24,48, and 380 h) with the following parameters: pulse angle of 30°, acquisition and decoupling time of approximately 0.75 s, and recycling delay of 10 s (much larger than the decoupling time). 1 H, 1 H-n X ( 13 C or 29 Si), and 1 H DOSY NMR spectroscopy experiments were recorded with a Bruker Avance III 300 spectrometer (300.13, 75.47, and 59.62 MHz for 1 H, 13 C, and 29 Si, respectively) using a 5 mm BBFO probe equipped with a z-gradient coil that provided a maximum gradient strength of 49.7 G cm -1 . 1 H, 1 H-n X ( 13 C or 29 Si), and 1 H DOSY NMR spectroscopy experiments were recorded with a Bruker Avance III 300 spectrometer (300.13, 75.47, and 59.62 MHz for 1 H, 13 C, and 29 Si, respectively) using a 5 mm BBFO probe equipped with a z-gradient coil that provided a maximum gradient strength of 49.7 G cm -1 .…”

Section: Characterization Techniquesmentioning

confidence: 99%

“…[4] Among them, the sol-gel process is a well-established one and allows preparation of homogeneous hybrids starting from alkoxide precursors and using hydrolysiscondensation reactions. [6][7][8][9][10][11][12][13][14][15][16][17][18][19][20] However, in the case of of condensation and the amount of water produced in situ. [1,2] Silsesquioxanes prepared by means of hydrolysis-condensation of organoalkoxysilanes have found applications among the most popular commercial sol-gel products, particularly in the field of coatings.…”

Section: Introductionmentioning

confidence: 99%

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Mechanism and Kinetics of Oligosilsesquioxane Growth in the In Situ Water Production Sol–Gel Route: Dependence on Water Availability

et al. 2016

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Thiol-functionalized nanobuilding blocks (NBBs) were synthesized from 3-mercaptopropyltrimethoxysilane by using the in situ water production (ISWP) process in which the water needed to hydrolyze the precursor was provided by means of an esterification reaction. In the present study the reaction between 1-propanol and chloroacetic acid was used. Whereas the growth of the Si oligomers was followed at room temperature and 100°C using 1D 29 Si and 2D 1 H-29 Si heteronuclear single quantum correlation (HSQC) NMR spectroscopic experiments, the amount of water delivered along the process was followed by means of 1 H NMR spectroscopy. The results show a good correlation between the evolution of the degree [a]

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Section: Characterization Techniquesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Mechanism and Kinetics of Oligosilsesquioxane Growth in the In Situ Water Production Sol–Gel Route: Dependence on Water Availability

et al. 2016

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“…Hence, we introduce methyltrimethoxysilane (MTMS) and dimethyldimethoxysilane (DMDMS) as two kinds of polymer matrix. Both MTMS and DMDMS are expected to obtain large amounts of hydroxyl groups on their surface, leading to desirable interfacial interactions through hydrogen bonding among MCC/MC and MTMS/DMDMS matrix. , After the completion of condensation reactions, the surface of the composite would mostly be covered by −CH 3 groups, a kind of typical hydrophobic functional group.…”

Section: Introductionmentioning

confidence: 99%

Preparation of MCC/MC Silica Sponge and Its Oil/Water Separation Apparatus Application

Liu

Zhang

Wang

et al. 2017

Ind. Eng. Chem. Res.

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A novel superoleophilic sponge, which has been prepared by a simple sol–gel process using microcrystalline cellulose (MCC) and methyl cellulose (MC), and its oil/water separation apparatus application are presented here. The samples were characterized by Scanning Electron Microscopy (SEM), X-ray diffraction (XRD), Fourier Transform Infrared Spectra (FTIR), and so on. The results indicated that MCC/MC silica sponge (MCC-CH3) had been successfully introduced CO and methyl groups and exhibits better mechanical properties, absorption capacity, and high oil selectivity. Besides, a novel oil–water separation apparatus was designed to make MCC-CH3 a further practical application. Based on this simple but flexible and intelligent design, oil collection, sorption materials regeneration, and free navigation can be simultaneously achieved in the remediation of oil spills. The results showed the discharge flow of n-hexane was about 11700 g·h–1·g–1, and the oil ratio of the discharge mixture reached 99% under a continuous operation.

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“…Such intermediates can be isolated and stored as liquid "precursor resins," 41 prior to final cure by polycondensation. In contrast to this, the alkaline catalysis 42,43 is known to yield compact and highly condensed polysiloxane particles in early reaction stages, which subsequently precipitate. The latter effect can be of use for the preparation of welldefined silica or of polysiloxane nano-and micro-particles.…”

Section: Introductionmentioning

confidence: 99%

Preparation of conducting polysiloxane/polyaniline composites

Depa

Strachota

Stejskal

et al. 2015

J of Applied Polymer Sci

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Polysiloxane/polyaniline microcomposites were prepared, in which polyaniline particles act as filler, thus combining the mechanical properties of polysiloxane matrix with conductivity of polyaniline. Two syntheses were evaluated: (1) homogeneous dispersion of a polyaniline colloid in the reaction mixture from which the polysiloxane matrix subsequently formed, and (2) the blending of previously prepared dry polyaniline particles with a liquid oligomeric siloxane resin followed by cure (“heterogeneous method”). Both methods lead to composites with evenly distributed filler. Electrical conductivity was achieved above 40 wt % of polyaniline, which is better obtained by the “heterogeneous” method. During the composite cure, the polyaniline particles, which are softer than the matrix, act as a catalyst and cause more efficient matrix crosslinking, thus leading to somewhat raised moduli. Although particulate fillers usually deteriorate the impact toughness, in the case of the prepared composites, the impact toughness was preserved due to the softer consistence of the filler, which hinders crack propagation. © 2015 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015, 132, 42429.

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Studies on dialkoxysilane hydrolysis kinetics under alkaline conditions

Cited by 10 publications

References 28 publications

Mechanism and Kinetics of Oligosilsesquioxane Growth in the In Situ Water Production Sol–Gel Route: Dependence on Water Availability

Mechanism and Kinetics of Oligosilsesquioxane Growth in the In Situ Water Production Sol–Gel Route: Dependence on Water Availability

Preparation of MCC/MC Silica Sponge and Its Oil/Water Separation Apparatus Application

Preparation of conducting polysiloxane/polyaniline composites

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