Distinguish between 
a. Manmade material and natural material 
b. Thermoplastic and thermosetting plastic.


a. Manmade material and natural material:
Manmade materials:
1. Natural materials are those material, which occur in nature by its own.
2. They are both renewable and non-renewable in nature.
3. They help in economic development of people.
4. They are eco-friendly.
5. They are not manufactured in factories.
4. Examples : wood, glass, plastic, thread, soil, metals, rubber etc.
Man made materials:
1. Man-made materials are a type of material that doesn't occur naturally and is made by humans.
2. They are non-renewable in nature.
3. They help in economic as well as social development
4. They are not environmental friendly.
5. They are not manufactured in factories.
4. Examples : glass, plastic, artificial thread, thermocol etc .  

b. Thermoplastic and thermosetting plastic:
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.- polyethylene, polystyrene, PVC, PVA etc.
e.g.- phenol formaldehyde, ureaformaldehyde, nylon 6:6 etc.


General Science -Solutions
Standard VIII

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