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प्रश्न
Attempt the following:
Write preparation, properties and uses of Teflon.
उत्तर
Preparation of teflon:
- The monomer used in preparation of teflon is tetrafluoroethylene, (CF2 = CF2), which is a gas at room temperature.
- Tetrafluoroethylene is polymerized by using free-radical initiators such as hydrogen peroxide or ammonium persulphate at high pressure to produce polytetrafluoroethylene (teflon).
\[\ce{\underset{Tetrafluoroethylene}{{n} CF2 = CF2}->[Polymerization][Peroxide]\underset{Teflon}{[-CF2 - CF2 -]}_{n}}\]
Properties of teflon:
- Teflon is tough, chemically inert and resistant to heat and attack by corrosive reagents.
- C – F bond is very difficult to break and remains unaffected by corrosive alkali, organic solvents.
Uses: Teflon is used in making non-stick cookware, oil seals, gaskets, etc.
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| Name of polymer | Monomer |
| 1. Teflon | a. CH2 = CH2 |
| 2. PVC | b. CF2 = CF2 |
| 3. Polyester | c. CH2 = CHCl |
| 4. Polythene | d. C6H5OH and HCHO |
| 5. Bakelite | e. Dicarboxylic acid and polyhydoxyglycol |
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\[\begin{array}{cc}
\phantom{....}\ce{O}\phantom{............}\ce{O}\phantom{...................}\ce{H}\phantom{.....}\\
\phantom{....}||\phantom{.............}||\phantom{...................}|\phantom{......}\\
\ce{-[C - (CH2)4 - C - NH - (CH2)6 - N -]_{{n}}}
\end{array}\]
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\[\ce{{n} CH2 = CH2 ->[333 K - 343 K][6 - 7 atm, catalyst] X}\]
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