Question

a) Which of the following is not applicable to Nylon 6,6?

i) Synthetic polymer

ii) Fibre

iii) Addition polymer

iv) Condensation polymer.

b) Differentiate between thermoplastics and thermosetting plastics. Write one example each to them.

Answer 1

a) Addition polymer

b)

Thermoplastic	Thermosetting
1. They can be reused	1. Cannot be reused
2. They can be repeated by softening on heating and hardening on cooling	2. On heating they undergo extensive cross-linking and become infusible
3. The are linear or lightly branched long - chain polymers	3. They are cross-linked or heavily branched polymers
4. Eg. Polythene, Polystryrene, Polyvinyl	4 Eg. Bakelite, urea- Formaldehyde Resin.