Maharashtra State BoardSSC (English Medium) 8th Standard
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Distinguish between Thermoplastic and thermosetting plastic. - Science

Distinguish Between

Distinguish between 

Thermoplastic and thermosetting plastic.

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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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Balbharati General Science 8th Standard Maharashtra State Board
Chapter 17 Man made Materials
Exercise | Q 4.2 | Page 121
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