Advertisements
Advertisements
प्रश्न
Answer the following.
Distinguish between thermosetting and thermoplastic resins. Write example of both the classes.
Advertisements
उत्तर
| Thermosetting resin | Thermoplastic resin |
| They do not soften on heating | They soften on heating and harden on cooling |
| They cannot be remoulded or reshaped. | These can be remoulded or reshaped. |
| They possess extensive cross-linking formed by covalent bonds. | They possess moderately strong intermolecular forces that are intermediate between elastomers and fibres. |
| They are rigid polymers. | They are not rigid polymers. |
| e.g. Bakelite, urea-formaldehyde resins, etc. | e.g. PVC, polythene, polystyrene, etc. |
APPEARS IN
संबंधित प्रश्न
How are polymers classified on the basis of polymerisation process?
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
Semisynthetic polymer among the following is ______________
Functional group present in terylene polymer is ______.
Explain the term copolymers with examples.
Write the preparation of nylon 6, 6.
Mention two properties and two uses of nylon 6, 6 polymers.
Which polymer from following is used as synthetic leather?
Which of the following statement is INCORRECT?
The monomers used in the preparation of dextron are ______.
Which of the following pair represents natural polymers?
Identify semisynthetic polymer.
∈-Caprolactum has ____________ carbon atoms in its ring.
Which of the following is INCORRECT regarding terylene?
Identify the natural polymer from the following.
Which among the following polymers is a copolymer?
Which among the following polymer is used to make crockeries?
Which of the following properties is of thermoplastic polymer?
Identify thermoplastic polymer from the following.
In the following reaction, the reason for why meta-nitro product also formed is:
Write the structure of isoprene and the polymer obtained from it.
Define homopolymer.
How are polymers classified into different categories on the basis of intermolecular forces? Give an example of a polymer of each of these categories.
Write names of two natural polymers.
The monomers of buna-S rubber are ______.
