Thermoplastic and thermosetting plastic.
|Thermoplastic polymers||Thermosetting polymers|
|These are formed by addition polymerisation||These are formed by condensation polymerization|
|Generally more expensive than thermosetting||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 once again. Highly flexible design|
|High-impact resistance||Low-impact resistance|
|Remoulding/reshaping capabilities||Cannot be remoulded or reshaped|
|Eco-friendly manufacturing||Eco-foe manufacturing|
|e.g.- polyethene, polystyrene, PVC, PVA etc.
||e.g.- phenol-formaldehyde, ureaformaldehyde, nylon 6:6 etc.|
Concept: Man-made Fibre: Plastics
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