Chemistry of the silylamines. II. The condensation of silylamines with silanediols

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Abstract
The condensation of mono‐ and difunctional silylamines with (C6H5)2Si(OH)2, (C2H5)2Si(OH)2, HO[Si(C6H5)2O]2H, HO[Si(CH3)2O]3H, and a 1530 mol. wt. hydroxy endblocked dimethylsilicone fluid was investigated. The structure of the reacting species, the addition of acid catalyst, temperature, and solvent were shown to have a marked effect on the reaction rate. The rate of reaction of silylamines toward a given silanediol decreased in the order The information obtained from the condensation of hexamethyltrisiloxane‐1,5‐diol and N,N‐diethylaminotrimethylsilane demonstrated that self‐condensation of the silanediol did not occur to any extent under the reaction conditions employed. This condensation reaction offers a unique approach to the synthesis of silicone polymers and copolymers allows control of the location of crosslinking sites in the silicone polymer chain, and affords a method for the preparation of silicone block copolymers.

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