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Studies on the synthesis and thermal properties of alkoxysilane‐terminated organosilicone dendrimers
Author(s) -
Saxena Kanak,
Bisaria C. S.,
Saxena A. K.
Publication year - 2010
Publication title -
applied organometallic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.53
H-Index - 71
eISSN - 1099-0739
pISSN - 0268-2605
DOI - 10.1002/aoc.1615
Subject(s) - dendrimer , thermogravimetric analysis , chemistry , silane , alkoxy group , vinyltriethoxysilane , polymer chemistry , silicone , epoxy , yield (engineering) , organic chemistry , materials science , alkyl , composite material
Silicone core dendrimers bearing terminal dialkoxy and trialkoxy silane groups were prepared in a three‐step synthesis. Initially, the SiH terminated multifunctional silicone dendrimer, i.e. tetrakis(dimethylsiloxy)silane, was prepared by the reaction of tetraethoxysilane and dimethylethoxysilane. Tetrakis(dimethylsiloxy)silane on reaction with allylglycidylether in the presence of Speier's catalyst under pressure (100 psi) yielded epoxy‐terminated dendrimer in very high yield (95%). The epoxy‐terminated dendrimer was reacted with aminopropylalkoxysilanes to yield the next‐generation dendrimer bearing dialkoxy and trialkoxy silane groups. The dendrimers were characterized by the usual physico‐chemical techniques, i.e. elemental analysis, FT‐IR, 1 H, 13 C and 29 Si NMR. Thermal studies (Thermogravimetric analysis and Thermomechanical analysis) of the alkoxy terminated dendrimers and its cured products were also carried out. Copyright © 2010 John Wiley & Sons, Ltd.