Advertisements
Advertisements
Question
Write preparation, properties, and uses of Teflon.
Advertisements
Solution
Preparation of Teflon:
- The monomer used in the 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 and organic solvents.
Uses: Teflon is used in making non-stick cookware, oil seals, gaskets, etc.
RELATED QUESTIONS
Write the chemical reaction to prepare novolac polymer.
Bakelite is the polymer of:
(a) Benzaldchyde and phenol
(b) Acetaldehyde and phenol
(c) Formaldehyde and phenol
(d) Formaldehyde and benzyl alcohol
Based on molecular forces, what type of polymer is neoprene?
Write the formulae of the raw materials used for preparation of Dextran.
The Zieglar-Natta catalyst is used in the preparation of _______.
(A) LDPE
(B) PHBV
(C) PAN
(D) HDPE
Write the structure of melamine.
Draw the structures of veronal and thymine.
Write the monomers of the following polymer :
Answer the following in one sentence.
Define the term: Vulcanization
Answer the following in one sentence.
What type of intermolecular force leads to high-density polymer?
Answer the following.
Write structure of natural rubber and neoprene rubber along with the name and structure of their monomers.
Name and draw structure of the repeating unit in natural rubber.
Identify condensation polymers and addition polymers from the following.
-(CH2 - CH = CH - CH2 -)n
Identify condensation polymers and addition polymers from the following.
-(CO(CH2)4 - CONH(CH2)6NH-)n
Attempt the following:
Write the chemical reactions involved in the manufacture of Nylon 6,6.
Answer the following.
Write main specialities of Buna-S, Neoprene rubber?
Write the name of the catalyst used for preparation of high density polythene polymer.
Monomer used for preparation of polyacrylonitrile is _____________
Mention two uses of LDP.
Write the name of one example of each polymer in which following repeating units.
\[\begin{array}{cc}
\ce{(-CF2-CF2-), -[NH-(CH2)5-CO] -, -(CH2-CH-), (-CH2-CH2-)}\\
\phantom{............................}|\\
\phantom{..............................}\ce{CN}
\end{array}\]
Write the name and formulae of the monomers used for the preparation of dacron.
Write two uses and two properties of polythene.
Explain vulcanization of rubber.
Define rubber.
Which of the following is used as a substitute for wool?
Identify the INCORRECT match.
Select the CORRECT match for both the polymers.
Which of the following polymers is obtained from chloroprene?
Novolac is obtained from ____________.
Which of the following compounds is used to prepare orlon?
Which among the following monomers is used to prepare Teflon?
Which among the following polymers is an example of addition polymer?
Which among the following polymers is used to manufacture chemical containers?
Phenol and formaldehyde undergo condensation to give a polymar (A) which on heating with formaldehyde gives a thermosetting polymer (B). Name the polymers. Write the reactions involved in the formation of (A). What is the structural difference between two polymers?
Which of the following is not a copolymer?
Which of the following polymer has ester linkage?
The catalyst used for the polymerisation of olefins is ______.
Answer the following.
Write the structure of isoprene and the polymer obtained from it.
Answer the following.
Name and draw structure of the repeating unit in natural rubber.
Name and draw the structure of the repeating unit in natural rubber.
Write the structure of isoprene and the polymer obtained from it.
Write the structure of isoprene and the polymer obtained from it.
Match the following pairs:
| Polymer | Monomer | ||
| (i) | Teflon | (a) | CH2 = CH2 |
| (ii) | PVC | (b) | CF2 = CF2 |
| (iii) | Natural rubber | (c) | Isoprene |
| (iv) | Polythene | (d) | H2C=CHCl |
The monomer used in preparation of teflon is ______.
Write the structure of isoprene and the polymer obtained from it.
Name and draw structure of the repeating unit in natural rubber.
Name and draw structure of the repeating unit in natural rubber.
Write the structure of isoprene and the polymer obtained from it.
Write the structure of isoprene and the polymer obtained from it.
Name and draw structure of the repeating unit in natural rubber.
