.(a) Explain the addition polymer by an example.
(b) Write the equation of preparation of synthetic rubber.
(c) Give the names of monomers used for obtaining dacron.

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Solution

(a) The addition polymer is formed by chain growth polymerisation. The monomer is alkene (such as ethylene). The addition polymer contains all the atoms of monomers. For example polythene is an addition polymer.
$n C H_{2} = C H_{2} polymerisation - -------- \to [- C F_{2} - C F_{2} -]_{n}$
(b) Write the equation of preparation of synthetic rubber.
(i) Buna-S or styrene butadiene rubber:
$n C_{6} H_{5} - C H = C H_{2} + n C H_{2} = C H - C H = C H_{2} K_{2} S_{2} O_{8} - ---- \to [- C (C_{6} H_{5}) - C H_{2} - C H_{2} - C H = C H - C H_{2} -]_{n}$
(ii) Buna-N:
$n C H_{2} = C H - C N + n C H_{2} = C H - C H = C H_{2} polymerisation - -------- \to [- C H_{2} - C H = C H - C H_{2} - C H_{2} - C H (C) -]_{n}$
(iii) Neoprene rubber:
$n C H_{2} = C - C l - C H = C H_{2} O_{2} - ----------- \to or benzoyl peroxide [- C H_{2} - C (C l) = C H - C H_{2} -]_{n}$
(c) Monomers used for obtaining dacron are ethylene glycol and dimethylterephthalate.

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