HARVARD UNIV CAMBRIDGE MA MALLINCKRODT LAB
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A study of the kinetics and mechanisms of the Kruger condensation of dimethylsilazane revealed that the evolution of ammonia which brings about the crosslinking could be suppressed by conducting the reaction under a pressure of ammonia. In fact, polymerization of cyclic dimethylsilazane could be accomplished by heating the silazane under ammonia pressure alone, without any Kruger catalyst. An equilibrium mixture resulted, from which a low yield of linear polymer was isolated. Elemental analysis, NMR spectra, and infrared absorption spectra all prove that this product is indeed linear polymer composed of a multiplicity of CH32Si-NH-units. The process is described, and variations of it are reported. Methods for improving the yield and for increasing the molecular weight now are being sought.
- Polymer Chemistry