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what is the difference between thermoplastics and thermosettingplastic ?

Thermoplastic polymers
Thermosetting polymers
(1) These soften and melt on heating.
These do not soften on heating but rather become hard in case prolonged heating is done these start burning.
(2) These can be remoulded recast and reshaped.
These can not be remoulded or reshaped.
(3) These are less brittle and soluble in some organic solvents.
These are more brittle and insoluble in organic solvents.
(4) These are formed by addition polymerisation.
These are formed by condensation polymerisation.
(5) These have usually linear structures.
Ex. Polyethylene, PVC, teflon.
These have three dimensional cross linked structures. Ex. Bakelite, urea, formaldehyde, resin.


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