Advertisements
Advertisements
Question
Explain thermoplastic and thermosetting polymers.
Advertisements
Solution
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
RELATED QUESTIONS
Answer the following in one sentence.
Name some chain-growth polymers.
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.
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.
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.
\[\begin{array}{cc}\ce{- (CH2 - CH -)_\text{n}}\\
\phantom{.....}|\\\ce{\phantom{.......}CN}\end{array}\]
Answer the following.
Explain in detail free radical mechanism involved during preparation of addition polymer.
Addition polymer among the following is ___________
Which of the following is a biodegradable polymer?
Explain homopolymers with examples.
Mention two properties and two uses of nylon 6, 6 polymers.
Explain the classification of polymers on the basis of origin.
Define fibres.
Which polymer from following is used as synthetic leather?
Identify the monomers used in the preparation of glyptal.
Which among the following is not a semi-synthetic polymer?
Which of the following compounds contain -CO-NH- linkage?
Which among the following polymers is a copolymer?
Which among the following polymer is used to make crockeries?
Which among the following polymers belongs to class thermoplastic polymers?
Write classification of polymers on the basis of structure.
A synthetic polymer which is an ester is ______.
Write the structure of isoprene and the polymer obtained from it.
Write the structure of monomer used in the preparation of
Define homopolymer.
