Question

Distinguish between

Thermoplastic and Thermosetting plastic.

Accepted Answer

Thermoplastic polymers Thermosetting polymers

These are formed by addition polymerisation These are formed by condensation polymerization

Generally more expensive than thermosettings Cost effective

Monomer used in these is generally bifunctional In this monomer used is tri, tetra or polyfunctional

Aesthetically-superior finishes More difficult to surface finish

They are long chain linear polymer with negligible cross links These have three- dimensional network structure with number of cross links

less resistant to high temperatures More resistant to high temperatures than thermoplastics

They have low molecular wt. They have high molecular wt

They are soft, weak , brittle They,are hard, strong and more brittle

Highly recyclable Cannot be recycled

They can be softened and reshaped and reused. They cannot be softened and reshaped again. Highly flexible design

High-impact resistance Low-impact resistance

Remolding/reshaping capabilities Cannot be remolded or reshaped

Eco-friendly manufacturing Eco-foe manufacturing

e.g.- polyethylene, polystyrene, PVC, PVA etc.

e.g.- phenol formaldehyde, ureaformaldehyde, nylon 6:6 etc.

Maharashtra Board Solutions for Chapter: Man Made Materials, Exercise 3: Exercises

Maharashtra Board General Science Solutions for Exercise - Maharashtra Board Solutions for Chapter: Man Made Materials, Exercise 3: Exercises

Questions from Maharashtra Board Solutions for Chapter: Man Made Materials, Exercise 3: Exercises with Hints & Solutions

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