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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?

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146.

What are linear polymer and branched chain polymers? How do these differ from own linked polymers?

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Short Answer Type

147.

Define a polymer. Write the monomer used for the preparation of dacron. Mention a use of it.

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148.
Explain with suitable examples:
(i) Natural polymers
(ii) Synthetic polymers.

(i) Natural polymers: Polymers found in nature, mostly from plants and animals, are called natural polymers. Examples are starch, cellulose, proteins, nucleic acids and natural rubber.

(ii) Synthetic polymers: Polymers synthesised by human in laboratory or factory are called synthetic polymers. Examples are polypropylene, nylon-66, polybutadiene, polyvinyl chloride (PVC), phenol formaldehyde (Bakelite), polyester (Terylene).

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