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>Exactly alternating silarylene–siloxane polymers. I. The synthesis and stability of bis(1,1‐tetramethylene‐3‐phenylureido)dimethylsilane
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Exactly alternating silarylene–siloxane polymers. I. The synthesis and stability of bis(1,1‐tetramethylene‐3‐phenylureido)dimethylsilane
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机译：Exactly alternating silarylene–siloxane polymers. I. The synthesis and stability of bis(1,1‐tetramethylene‐3‐phenylureido)dimethylsilane
AbstractUreidosilanes have been found to be active monomers for the preparation of siloxane polymers by step‐growth polymerization reactions at low temperatures. For this purpose, very high monomer purities are required, and the present investigation was concerned with the purity and stability of bis(1,1‐tetramethylene‐3‐phenylureido)dimethylsilane prepared from the diaminosilane and phenyl isocyanate. Preparation of the monomer by this reaction at −20°C gave directly a product of very high purity suitable for the preparation of very high molecular weight polymers. Pseudo‐first‐order rate constants were obtained on the hydrolysis of the monomer during synthes
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