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of cyclic siloxanes. A representative reaction would start with hexamethyltrisiloxane:
: In reality, a series of ring sizes comprise the precursor cyclic siloxanes. The reaction is typically catalyzed by base, such as an alkali metal oxide. The base must be removed when the polymerization is complete.

Branching and capping

Hydrolysis of generates a polymer that is terminated with silanol groups . These reactive centers are typically "capped" by reaction

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