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The monovalent radical, CH3CH2O-.
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This means that one or more of the alkoxy groups has been replaced with a metallic species, and that the alkyl group is a methyl group.
In addition, capture of the excess moisture coming from the surrounding environment by the hydrolysis reactions of active alkoxy groups in silane can also be expected, by which the free-state water absorption can be consumed (27).
However, once the silanes have been hydrolyzed or reacted to the mineral surface, the nature of the alkoxy group is no longer an issue.
Ethoxy group is the best as the alkoxy group of the polysiloxane for improving the processing characteristics of the compounds.
In the presence of moisture, hydrolysable alkoxy group leads to the formation of silanols.
Hence, the number of alkoxy groups in alkoxy-based silanes is equalized so that the silanization or hydrophobation effects can be compared for each compound.
101), (102) In either case, reaction of the silane with organic polymer binder followed by hydrolysis and condensation reactions of the alkoxy groups on Si is responsible for the cross-linking.
s at 25 [degrees] C, that the platinum catalysts (C) are free of phosphoric acid trisamide ligands, that the reinforcing fillers (D) are present in amounts of at least 3% by weight, relative to the total mass of the compositions, that the non-reinforcing fillers (F) are present in lower amounts than the reinforcing fillers (D), that the use of reactive silanes as bonding agents and the use of additional condensation catalysts, which accelerate the condensation reaction of Si-bound hydroxy groups and/or alkoxy groups, are excluded).
Its lower reactivity compared to trimethoxysilane could be explained by different influences of alkyl and alkoxy groups on the polarity and stability of the Si-H bond.
A polysiloxane has a formula where each R1 is selected from alkyl, aryl and alkoxy groups having up to six carbon atoms, reactive glycidoxy groups and OSi(OR3)3 groups.
Because of their high Si-O-Si contents that results from the loss of alkoxy groups and a series of silanol/silanol or silanol/silyl ether condensation reactions, these resins bear a general resemblance to silica and potentially have properties suitable for use in polymeric dental materials, both as components of the resin matrix phase or as organically modified silica fillers with molecular dimensions.
Heteroatomic functional groups are represented mostly by oxygen-containing ones, more than two third of these groups are hydroxyl and alkoxy groups.