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Polymers

Long Answer Type

141.

Elaborate the structure of natural rubber.

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142. Why does styrene undergo anionic polymerization easily?

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143. Explain how does 1, 3-butadiene polymerize by different routes?

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144.

Give the monomers and uses of each of the following addition polymers:
(a) Polyethylene

(b) Polypropylene

(c) Polystyrene.

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145. How does the presence of benzoquinone inhibit the free radical polymerization of a vinyl derivative?

In the free radical polymerization of vinyl derivative, a reactive intermediate (R*) is formed which is responsible for the further progress of the chain reaction. Benzoquinone traps this reactive intermediate radical and changes it into non-reactive radical by stabilising it through resonance. In the absence of this reactive intermediate, further progress of the chain reaction is stopped.