NEW METHODS FOR PREPARING SILICON-NITROGEN POLYMERS
HARVARD UNIV CAMBRIDGE MA MALLINCKRODT LAB
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One project involved the reaction, dimethyldichlorosilane with ammonium halides as sources of nitrogen. When these experiments showed little or no interaction, ammonolysis of dimethyldichlorosilane at 200 in the presence of ammonium bromide was tried. Octamethylcyclotetrasilazane was obtained, together with some liquid polymer which was of the same cross-linked character as that obtained by Krugers sequential ammonolysis and catalytic polymerization. No larger proportion of linear dimethylsilazane resulted, hence, there is no advantage to the procedure. A second project, sym- dimethoxytetramethyldisilazane and the corresponding tri and tetrasilazanes were prepared by the reaction of dimethyldichlorosilane with methanol, followed by treatment with annhydrous ammonia. The infrared and NMR spectra of these compounds were examined. Prolonged heating of the disilazane in the presence of sodium methoxide, aluminum methoxide and isopropoxide, and potassium tertiarybutoxide led to the formation of low-molecular -weight linear silicon- nitrogen polymers, as well as to some other silicon-nitrogen substances of a more complicated nature.
- Organic Chemistry