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प्रश्न
Attempt the following:
Explain the vulcanisation of rubber. Which vulcanizing agents are used for the following synthetic rubber?
a. Neoprene
b. Buna-N
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उत्तर
The process by which a network of cross-links is introduced into an elastomer is called vulcanization. The profound effect of vulcanization enhances the properties like tensile strength, stiffness, elasticity, toughness; etc. of natural rubber.
a. Neoprene: MgO is used to vulcanize neoprene.
b. Buna-N: Sulfur is used to vulcanize Buna-N.
APPEARS IN
संबंधित प्रश्न
Write any ‘two’ uses of terylene.
Explain the following term: Homopolymers
Based on molecular forces, what type of polymer is neoprene?
Choose the correct option from the given alternatives.
Which of the following is made up of polyamides?
Answer the following in one sentence.
Define the term: Vulcanization
Answer the following in one sentence.
Identify thermoplastic and thermosetting plastic from the following:
- PET
- Urea formaldehyde resin
- Polythene
- Phenol formaldehyde resin
Answer the following.
Write the reaction of the formation of Nylon 6.
Answer the following.
Write structure of natural rubber and neoprene rubber along with the name and structure of their monomers.
Answer the following.
Match the following pairs:
| 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 |
Answer the following.
Draw the structures of polymers formed from the following monomers
H2N–(CH2)5 – COOH
Identify condensation polymers and addition polymers from the following.
-(CO(CH2)4 - CONH(CH2)6NH-)n
Write the reaction involved in the formation of bakelite.
Attempt the following:
What is meant by LDP and HDP? Mention the basic difference between the same with suitable examples.
Write preparation, properties, and uses of Teflon.
Write the structure of isoprene and the polymer obtained from it.
Monomer used for preparation of polyacrylonitrile is _____________
Monomers ethylene glycol and terephthalic acid undergo condensation polymerization to give polymer called ___________
Monomer of natural rubber is __________
Write two uses and two properties of polythene.
Explain the reactions involved in the preparation of viscose rayon.
Which of the following is used as a substitute for wool?
Which of the following polymer is used in paints?
Identify additional polymers from the following.
I. \[\begin{array}{cc}
\ce{-(CH2 - CH -)_{{n}}}\\
\phantom{....}|\\
\phantom{.......}\ce{C6H5}
\end{array}\]
II. \[\ce{-(CH2 - CH = CH - CH2 -)_{{n}}}\]
III. \[\ce{-(CO(CH2)4 - CONH(CH2)6NH -)_{{n}}}\]
IV.
How many isoprene units are present in abscisic acid?
Which of the following is the monomer of neoprene?
Novolac is obtained from ____________.
Which of the following polymers is a heteropolymer?
Which of the following catalysts is used in preparation of terylene?
Which among the following polymers is obtained from CH2 = CH – CN by polymerisation?
Identify the catalyst used in the manufacture of high density polythene.
Which of the following pair of compounds is used as monomers for bakelite?
Which of the following polymer is used to make blankets?
Which of the following is not a semisynthetic polymer?
Which of the following polymers, need atleast one diene monomer for their preparation?
(i) Dacron
(ii) Buna-S
(iii) Neoprene
(iv) Novolac
Name the polymers used in laminated sheets and give the name of monomeric units involved in its formation.
Which of the following is not a copolymer?
Which of the following products is formed when benzaldehyde is treated with CH3MgBr and the addition product so obtained is subjected to acid hydrolysis?
F2C = CF2 is monomer of the polymer -
Which of the following is an example of polyester?
Which of the following polymers is synthesized using a free radical polymerisation technique?
The catalyst used for the polymerisation of olefins is ______.
Which of the following is a polymer of enzyme?
Which of the foolowing polymer is used in the manufacture of insulators.
The monomer of natural rubber is ______.
Answer the following.
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.
Write the name of the monomer of natural rubber.
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.
Write the structure of isoprene and the polymer obtained from it.
Which among the following is a monomer of natural rubber?
