Distinguish between thermoplastic and thermosetting polymers.

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Thermoplastic polymers	Thermosetting polymers
These are formed by addition polymerisation	These are formed by condensation polymerization
Monomer used in these is generally bifunctional	In this monomer used is tri, tetra or polyfunctional
They are long chain linear polymer with negligible cross links	These have three- dimensional network structure with number of cross links
They have low molecular wt.	They have high molecular wt
They are soft, weak , brittle	They,are hard, strong and more brittle
They can be softened and reshaped and reused.	They cannot be softened and reshaped again once again.
e.g.- polyethylene, polystyrene, PVC, PVA etc.	e.g.- phenol formaldehyde, ureaformaldehyde, nylon 6:6 etc.

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