The time evolution of the sol-gel process:29Si NMR study of hydrolysis and condensation reactions of tetramethoxysilane

1999 ◽  
Vol 16 (4) ◽  
pp. 547-557 ◽  
Author(s):  
M. Mazúr ◽  
V. Mlynárik ◽  
M. Valko ◽  
P. Pelikán
Keyword(s):  
Time Evolution ◽  
Sol Gel ◽  
29Si Nmr ◽  
Condensation Reactions ◽  
Nmr Study ◽  
Sol Gel Process ◽  
Hydrolysis And Condensation

Organic–inorganic hybrids having a talc-like structure as suitable hosts to guest a wide range of species

2018 ◽  
Vol 47 (9) ◽  
pp. 2925-2932 ◽  
Author(s):  
J. Brendlé
Keyword(s):  
Hybrid Materials ◽  
Sol Gel ◽  
Step Method ◽  
Mild Conditions ◽  
Condensation Reactions ◽  
Wide Range ◽  
Sol Gel Process ◽  
Hydrolysis And Condensation ◽  
One Step

The sol–gel process involving hydrolysis and condensation reactions is an attractive way to form siloxane based hybrid materials since it is a one-step method performed under mild conditions.

29Si Nmr Study of Hydrolyzed Teos-Rteos (R: Methyl, Ethyl, Phenyl) Systems

1998 ◽  
Vol 519 ◽  
Author(s):  
J. Mendez-Vivar ◽  
A. Mendoza-Bandala ◽  
A. Gutierrez ◽  
G. Cao
Keyword(s):  
29Si Nmr ◽  
Methyl Ethyl ◽  
Molar Ratios ◽  
Condensation Reactions ◽  
Nmr Study ◽  
Hydrolysis And Condensation

AbstractSols composed of Tetraethoxysilane (TEOS) and RTEOS (R: methyl, ethyl, phenyl) catalyzed with HCl were prepared. The molar ratios TEOS :RTEOS:EtOH:H20:HC1 were (1.0-0.8947):(5.26×10−2-0.1579):0.95:1.0:7×10−4, respectively. The sols were analyzed by 29 Si NMR immediately after mixing the reagents in order to study the hydrolysis and condensation reactions. A predominant self-condensation was observed in the TEOS-ETEOS sol, compared to cross-condensation. This result was opposite to the behaviour of the TEOS-MTEOS and TEOS-PTEOS sols.

High pressure 29Si NMR study of the sol-gel process

1991 ◽  
Vol 48 (2-4) ◽  
pp. 227-231 ◽  
Author(s):  
D.W. Hua ◽  
Y. Masuda ◽  
J. Jonas
Keyword(s):  
High Pressure ◽  
Sol Gel ◽  
29Si Nmr ◽  
Nmr Study ◽  
Sol Gel Process

29Si NMR study of the initial stage of the sol-gel process under high pressure

1985 ◽  
Vol 72 (2-3) ◽  
pp. 391-402 ◽  
Author(s):  
I. Artaki ◽  
S. Sinha ◽  
A.D. Irwin ◽  
J. Jonas
Keyword(s):  
High Pressure ◽  
Sol Gel ◽  
29Si Nmr ◽  
Nmr Study ◽  
Initial Stage ◽  
Sol Gel Process

Liquid state 29Si NMR study on the sol-gel reaction mechanisms of ormosils

1993 ◽  
Vol 159 (1-2) ◽  
pp. 65-72 ◽  
Author(s):  
Takashi Iwamoto ◽  
Kazuki Morita ◽  
John D. Mackenzie
Keyword(s):  
Reaction Mechanisms ◽  
Liquid State ◽  
Sol Gel ◽  
29Si Nmr ◽  
Nmr Study

Sol-Gel Polymerization of Tetraalkoxygermanium and Organotrialkoxygermanium Monomers

1996 ◽  
Vol 431 ◽  
Author(s):  
Brigitta M. Baugher ◽  
Douglas A. Loy
Keyword(s):  
Chemical Modification ◽  
Sol Gel ◽  
Silica Gels ◽  
Germanium Oxide ◽  
Oxide Materials ◽  
Siloxane Bond ◽  
Mild Conditions ◽  
Condensation Reactions ◽  
Hydrolysis And Condensation ◽  
Opening Up

AbstractWhile the sol-gel polymerizations of tetraalkoxy- and organotrialkoxysilanes have been extensively studied, there have been few reports of similar investigations with the analogous tetraalkoxygermanium and organotrialkoxygermanium compounds. Germanium alkoxides have received less attention due, in part to their higher cost, but also their greater reactivity towards hydrolysis and condensation reactions. Germanium oxide materials are potentially interesting because the Ge-O-Ge linkage is labile (compared with the siloxane bond in silica gels and polysilsesquioxanes) opening up the possibility of further chemical modification of the polymeric architecture. This may permit hydrolytic reorganization of germanium oxide networks under relatively mild conditions. In this paper, we will present the results of our investigations of the solgel polymerizations of tetraethoxygermanium 1, tetraisopropoxygermanium 2, and methyltriethoxy-germanium 3 to afford network materials as both xerogels and aerogels.

scholarly journals Spinnability of Silica Sols: the Role of Alkoxy Group Exchange

1994 ◽  
Vol 346 ◽  
Author(s):  
S. Prabakar ◽  
R.A. Assink ◽  
A.D. Irwin
Keyword(s):  
Sol Gel ◽  
Alkoxy Group ◽  
Condensation Reactions ◽  
Hydrolysis And Condensation ◽  
Silica Sols

ABSTRACTThe exchange and spinnability of several systems with the general form Si(OR)4 (where R = CH3, C2H5) in ethanol, propanol and butanol were investigated. We have followed the alkoxy group exchange, the hydrolysis and condensation reactions and the Q distributions of these systems using 29Si and 17O NMR. The observed differences in spinnability of the various sol-gel systems are attributed to the effect of the bulkiness of the alkoxy group on its reactivity.

scholarly journals Preparation of sol–gel hybrid materials from γ-methacryloxypropyltrimethoxysilane and tetramethyl orthosilicate: study of the hydrolysis and condensation reactions

2011 ◽  
Vol 289 (17-18) ◽  
pp. 1875-1883 ◽  
Author(s):  
Amir A. El hadad ◽  
Diogenes Carbonell ◽  
Violeta Barranco ◽  
Antonia Jiménez-Morales ◽  
Blanca Casal ◽  
...  
Keyword(s):  
Hybrid Materials ◽  
Sol Gel ◽  
Condensation Reactions ◽  
Hydrolysis And Condensation
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