Synthesis and characterization of polysiloxanes with pendant bicyclic fragments

✍ Scribed by O. Mukbaniani; T. Tatrishvili; G. Titvinidze; S. Patsatsia

• Publisher: John Wiley and Sons
• Year: 2010
• Tongue: English
• Weight: 773 KB
• Volume: 120
• Category: Article
• ISSN: 0021-8995
• DOI: 10.1002/app.33164

✦ Synopsis

The hydrosilylation reactions of 5-vinyl-2-norbornene with a,x-bis(trimethylsiloxy)methylhydrosiloxane catalyzed by platinum hydrochloric acid (0.1M solution in tetrahydrofuran), Karstedt's catalyst (Pt 2 [(VinSiMe 2 ) 2 O] 3 ) and platinum on the carbon have been studied. Dependence of reaction rate and active BSiAH bonds' conversion depth on the catalyst was investigated. Even in the excess of the 5vinyl-2-norbornene, not all active BSiAH groups participate in the hydrosilylation reaction. The reaction order, activation energies, and rate constants have been determined for hydrosilylation reactions in the presence of H 2 PtCl 6 . The synthesized oligomers were characterized by Fourier transform infrared spectroscopy (FTIR), 1 H, 13 C, 1 H-1 H correlation spectroscopy (COSY), and C,H-correlation NMR spectroscopy. Synthesized polysiloxanes were characterized by wideangle X-ray, gel-permeation chromatography, and DSC analyses. Calculations using the quantum-chemical semiempirical AM1 method for modeling reaction between methyldimethoxysilane [Me(MeO) 2 SiH] and 5-vinyl-2-norbornene were performed to evaluate possible reaction paths.