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What are silicones ? How are they obtain...

What are silicones ? How are they obtained?

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Silicones are organo silicon compounds containing `(R_2Si - O)` as repeating unit. First alkyl or aryl substituted chlorosilanes are prepared. These on hydrolysis followed by condensation, playmerisation gives polymeric silicones. Eg.

This reaction continue to give chain polymers. If water molecule is eliminated from the terminal OH groups of same chain cyclic, silicones are formed.
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