Explain the types of silicones.

Explanation

(i) Linear silicones: They are obtained by the hydrolysis and subsequent condensation of dialkyl or diaryl silicon chlorides.
(a) Silicon rubbers: These silicones are bridged together by methylene or similar groups.
(b) Silicon resins: They are obtained by blending silicones with organic resins such as acrylic esters.
(ii) Cyelic silicones: These are obtained by the hydrolysis of `R_(2)SiCl_(2)`
(iii) Cross linked silicones: They are obtained by hydrolysis of `RSiCl_(3)`