SSC (English Medium) Class 8Maharashtra State Board
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Distinguish Between - SSC (English Medium) Class 8 - Science

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Question

Distinguish between 

Thermoplastic and thermosetting plastic.

Solution

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 once 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.- polyethtlene , polystyrene , PVC , PVA etc.
 
e.g.- phenol formaldehyde, ureaformaldehyde, nylon 6:6 etc.
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APPEARS IN

 Balbharati Solution for Balbharati Class 8 Science - General Science (2018 to Current)
Chapter 17: Man made Materials
Exercise | Q: 4.2 | Page no. 121
Solution Distinguish Between Concept: Concept of Plastics.
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