Advertisements
Advertisements
प्रश्न
Explain thermoplastic and thermosetting polymers.
Advertisements
उत्तर
Thermoplastic polymers:
- Thermoplastic polymers have the property of plasticity, that is, these polymers can be easily shaped or moulded.
- They are capable of repeated softening on heating and hardening on cooling.
- These polymers possess moderately strong intermolecular forces that are intermediate between elastomers and fibres.
e.g. Polythene, polystyrene, polyvinyl, etc.
Thermosetting polymers:
- Thermosetting polymers are rigid polymers.
- During their formation, they have the property of being shaped on heating; but they get hardened while hot. Once hardened, they cannot be softened by heating and therefore cannot be remoulded.
- This characteristic is the result of extensive cross-linking by covalent bonds formed in the moulds during the hardening/setting process while hot.
e.g. Bakelite, urea-formaldehyde resin, etc.
APPEARS IN
संबंधित प्रश्न
Answer the following in one sentence.
Define the term: Synthetic fibres
Answer the following.
Write the names of classes of polymers formed according to intermolecular forces and describe briefly their structural characteristics.
Answer the following
How is polythene manufactured? Give their properties and uses.
Attempt the following:
Classify the following polymer as straight-chain, branched-chain and cross-linked polymers.
\[\begin{array}{cc}\ce{- (CH2 - CH -)_\text{n}}\\
\phantom{.....}|\\\ce{\phantom{.......}CN}\end{array}\]
Chemical combination of Ziegler-Natta catalyst is ______________
Write the number of carbon atoms present in the monomer used for preparation of nylon 6 polymer.
Functional group present in terylene polymer is ______.
Mention two properties and two uses of nylon 6, 6 polymers.
Identify the monomers used in the preparation of glyptal.
The total number of electrons around the carbon atom of methyl tree radical are ______.
Which among the following is not a semi-synthetic polymer?
∈-Caprolactum has ____________ carbon atoms in its ring.
Which of the following is INCORRECT regarding terylene?
Which among the following polymers belongs to class thermoplastic polymers?
Write classification of polymers on the basis of structure.
The polymer used in making synthetic hair wigs is made up of ______.
Identity semisynthetic polymer from following.
Write the structure of isoprene and the polymer obtained from it.
Define the synthetic polymers.
Define the semisynthetic polymers.
Write the structure of monomer used in the preparation of
What are homopolymers?
