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Question 17

Write the names and structures of the monomers of the following polymers:

(i) Buna-S  (ii) Buna-N

(iii) Dacron  (iv) Neoprene

Answer

 

Polymer

Monomer

Structure of monomer

i

Buna-S

1, 3-butadiene

CH2 = CH – CH = CH2

Styrene

C6H5CH = CH2

ii

Buna-N

1, 3-butadiene

CH2 = CH – CH = CH2

Acrylonitrile

CH2 = CH – CN

iii

Neoprene

Chloroprene

iv

Dacron

Ethylene glycol

HOH2C –CH2OH

Terephthalic acid

1) Buna-S(styrene butadiene rubber)- It is obtained by the polymerization of Buta-1,3-diene & styrene in the ratio of 3:1 in the presence of sodium.It is used for making automobile tyres & footwear.

 

2) Buna –N (Nitrile rubber)- It is obtained by polymerization of 1,3-butadiene & acrylonitrile in the presence of a peroxide catalyst.It is used for making oil seals,manufacture of hoses & tank linings.



 

3) Dacron – It is obtained by the polymerization of ethylene glycol & terphthalic acid.

 

4) Neoprene –It is prepared by the free radical polymerization of chloroprene.It is used as insulator, for making belts, gaskets,hoses etc.

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