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Synthesis of New Methylsiloxane Oligomers with Pendant Trialkoxysilylethyl Groups for Preparation of Silicon hard Coatings
Author(s) -
Mukbaniani O.,
Zaikov G. E.,
Tatrishvili T.,
Titvinidze G.,
Phatsatsia S.
Publication year - 2007
Publication title -
macromolecular symposia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.257
H-Index - 76
eISSN - 1521-3900
pISSN - 1022-1360
DOI - 10.1002/masy.200750146
Subject(s) - hydrosilylation , polymer chemistry , gel permeation chromatography , thermogravimetric analysis , silicon , catalysis , fourier transform infrared spectroscopy , differential scanning calorimetry , platinum , chemistry , materials science , organic chemistry , chemical engineering , polymer , physics , engineering , thermodynamics
For the purpose to prepare precursor materials for the silicon hard coatings, the hydrosilylation reactions of α, ω–bis(trimethylsiloxy)methylhydridesiloxane to trialkoxyvinylsilanes in the presence of platinum hydrochloric acid (0.1 M solution in THF), Karstedt's catalyst (Pt 2 [(VinSiMe 2 ) 2 O] 3 ) and platinum on the carbon (5%) were investigated. Hydrosilylation reactions at different ratios of initial compounds and at various temperatures (40–60 °C) were investigated and methylsiloxane oligomers with pendant trialkoxy fragments have been obtained. It was shown that completely hydrosilylation of all active SiH groups do not take place. The hydrosilylation reaction order, activation energy and rate constants were determined. The synthesized oligomers were characterized by 1 H, 13 C NMR and FTIR spectra data. Gel‐permeation chromatography, differential scanning calorimetric, thermogravimetric and wide‐angle X‐ray investigations of synthesized oligomers were carried out. Synthesized oligomers together with tetraethoxysilane were used for preparation of silicon hard coatings via sol‐gel processes.