Discussion
Among the following substituted silanes, the one that gives cross-linked silicone polymer upon hydrolysis is
Answer: B
The silane is CH3SiCl3.
Hydrolysis turns each Si-Cl bond into Si-OH, and the silanols condense into Si-O-Si links. The number of chlorines decides how many links each silicon can make:
- CH3SiCl3 gives CH3Si(OH)3, which can form three Si-O-Si links: a three-dimensional, cross-linked network.
- (CH3)2SiCl2 forms two links per silicon: linear chains or rings of silicone.
- (CH3)3SiCl forms one link: it caps chains, giving only the dimer (CH3)3Si-O-Si(CH3)3.
- (CH3)4Si has no Si-Cl bond and does not hydrolyse.
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