synopsis Polyarylenepolysiloxanes with varied structure can be obtained in condensation reactions of arylenediilanols and N-methylsiloxazanes. Molecular weights, viscometric properties, glsss transition temperatures, and thermogravimetric analysis data are reported.

No abstract

Cyclodisilazanes with mixed silicon-substituted groups {Cl(CH8)RSi[SiR(CH8)N]2SiR(CH3)Cl} can be prepared either by heating mixtures of [R(CH3)SiNH]3 and R(CH3)SiCl2 or by treating HN[Si(CH3)RCl]2 with butyllithium and heating the product. One or both of the methods are shown to be applicable where R is ethyl, vinyl, phenyl, or 3,3,3-trifluoropropyl as well as methyl. The properties of the intermediate cyclotrisilazanes and disilazanes as well as the dialkylamino derivatives of the cyclodisilazanes are described.

No abstract

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