Write the names and structures of the monomers of the following polymers:
(i) Buna-S (ii) Buna-N
(iii) Dacron (iv) Neoprene
|
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 and styrene in the ratio of 3:1 in the presence of sodium. It is used for making automobile tyres and footwear.
2) Buna-N (Nitrile rubber)- It is obtained by polymerization of 1,3-butadiene and acrylonitrile in the presence of a peroxide catalyst. It is used for making oil seals, manufacture of hoses and tank linings.
3) Dacron – It is obtained by the polymerization of ethylene glycol and 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.
The reaction between A and B is first order with respect to A and zero order with respect to B. Fill in the blanks in the following table:
| Experiment |
A/ mol L - 1 |
B/ mol L - 1 |
Initial rate/mol L - 1 min - 1 |
| I | 0.1 | 0.1 |
2.0 × 10 - 2 |
| II | -- | 0.2 |
4.0 × 10 - 2 |
| III | 0.4 | 0.4 | -- |
| IV | -- | 0.2 |
2.0 × 10 - 2 |
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Polymer
Monomer
Structure of monomer
i
Buna-S
1, 3-butadiene
CH2 = CH – CH = CH2
...
Step-by-step explanation:
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