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प्रश्न
How are polymers classified on the basis of polymerisation process?
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उत्तर
On the basis of mode of polymerisation, polymers are classified into the following groups:
Addition polymers or chain growth polymers:
- A polymer formed by direct addition of repeated monomers without the elimination of byproduct molecules is called addition polymer.
- In this, the monomers are alkenes, alkadienes (or their derivatives) or alkynes.
- All the atoms of monomers are present in the addition polymer and they have the same empirical formula as their monomer. eg. Orlon/ acrilan / polyacrylonitrile (PAN):
Condensation polymers or step growth polymers:
- A polymer formed by the condensation of two or more than two monomers with the elimination of simple molecules like water, methyl alcohol, hydrogen
chloride, ammonia, etc. is called condensation polymer. - In this, bifunctional or trifunctional monomeric units undergo condensation.
- All the atoms of monomers are not present in the condensation polymer.
- There are ester or amide linkages in the condensation polymer.
- Condensation polymer is formed in a stepwise manner (dimer, tetramer, … and so on).
eg. Nylon-6,6:
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संबंधित प्रश्न
Answer the following in one sentence.
Name some chain-growth polymers.
Answer the following in one sentence.
Give one example each of copolymer and homopolymer.
Answer the following.
Classify the following polymers as natural and synthetic polymers
- Cellulose
- Polystyrene
- Terylene
- Starch
- Protein
- Silicones
- Orlon (Polyacrylonitrle)
- Phenol-formedehyde resins
Answer the following.
What are synthetic resins? Name some natural and synthetic resins.
Attempt the following:
Classify the following polymer as straight-chain, branched-chain and cross-linked polymers.
\[\begin{array}{cc}\ce{- (CH2 - CH -)_\text{n}}\\
\phantom{.....}|\\\ce{\phantom{.......}CN}\end{array}\]
Answer the following.
Explain in detail free radical mechanism involved during preparation of addition polymer.
Explain the term copolymers with examples.
Explain thermoplastic and thermosetting polymers.
Explain homopolymers with examples.
Write the preparation of nylon 6, 6.
Explain the classification of polymers on the basis of origin.
Define fibres.
Which of the following properties is of the thermosetting polymers?
The total number of electrons around the carbon atom of methyl tree radical are ______.
Which of the following statement is INCORRECT?
Which of the following is a natural polymer?
A polymer which becomes soft on heating and hard on cooling, belongs to class of ______.
Identify semisynthetic polymer.
Identify the natural polymer from the following.
Which among the following polymers belongs to the class elastomers?
Which among the following polymers belongs to class thermoplastic polymers?
Which of the following properties is of thermoplastic polymer?
Write classification of polymers on the basis of structure.
The polymer used in making handles of cookers and frying pans is ______.
Which among the following is branched polymer?
Wool is ______ fibre.
Define the semisynthetic polymers.
Write the structure of monomer used in the preparation of
Write names of two natural polymers.
