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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?

1,2-polymerization. 1, 3-butadiene can undergo polymerization at C₁, and C₂ to yield the polymeric product, polyvinyl polythene.

(ii) 1,4-polymerization. When the polymerization takes place at C₁, and C₄ of butadiene, an unbranched polymer is formed. A carbon bond at each of its carbons is substituted by different groups and hence exist either as trans-polybutadiene or cis-polybutadiene or a mixture as shown below:

R* + CH₃ = CH–CH = CH₂ → R–CH₂–C*H–CH = CH₂

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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.

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149.

Write the names and molecular structure of the monomers of the following:
(i) Natural rubber (ii) Neoprene.

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150.

Write the names and structures of the monomers of the following polymers:
(i) Polystyrene (ii) Neoprene.

828 Views