Synthesis, Characterization, and Solubility Behavior of Polysiloxanes with 4-(Dialkylamino)Pyridine Functions

摘要

New silane monomers which contain the 4-(dialkylamino)pyridine (DAAP) functionhave been synthesized by hydrosilylation of 4-(N-methylallylamino)pyridine with MenSi(OEt)s-nH(n=0,1) and 4-(diallylamino)pyridine with MenSi(OEt)3-nH(n=0-2) using H2PtCl6 as a catalyst. Only Beta-addition products were observed. The products were characterized by elemental analysis, infrared and 1H and 13C NMR spectroscopy, and gas chromatography-mass spectrometry. Hydrolysis-polycondensation of the respective difunctional monomers with a basic catalyst gave a mixture of linear homopolymer and cyclic oligomers from the monomer with a pendant DAAP residue and only the linear homopolymer from the monomer with the in-chain DAAP residue. The linear homopolymers were trimethylsiloxy end-blocked by reaction with (Me3Si)2NH or bis(trimethylsilyl)acetamide.