(iii) The molecular weight of polydimethylsiloxane can be controlled by addition of a silicon-based reagent. Suggest the identity of this reagent and explain its effect on the polymerisation reaction. (iv) The properties of polydimethylsiloxane can be changed by the altering the degree of branching of the polymer chains. A silicon-based reagent can be added to promote chain branching during polymerisation. Suggest the identity of this reagent and explain how it promotes chain branching.

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Chapter1: Chemical Foundations
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(iii) The molecular weight of polydimethylsiloxane can be controlled by addition of
a silicon-based reagent. Suggest the identity of this reagent and explain its
effect on the polymerisation reaction.
(iv) The properties of polydimethylsiloxane can be changed by the altering the
degree of branching of the polymer chains. A silicon-based reagent can be
added to promote chain branching during polymerisation. Suggest the identity
of this reagent and explain how it promotes chain branching.
Transcribed Image Text:(iii) The molecular weight of polydimethylsiloxane can be controlled by addition of a silicon-based reagent. Suggest the identity of this reagent and explain its effect on the polymerisation reaction. (iv) The properties of polydimethylsiloxane can be changed by the altering the degree of branching of the polymer chains. A silicon-based reagent can be added to promote chain branching during polymerisation. Suggest the identity of this reagent and explain how it promotes chain branching.
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