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Thermoplastic / Thermosoftening plastics |
Thermosetting plastics |
1. |
The plastics who possess linear long-chain structures without cross-linkages are called thermosoftening plastics. It is also called as thermoplastic. |
The plastics that possess a three-dimensional complicated structure with cross-linkages are called thermosetting plastics. |
2. |
They are formed by additional polymerization. |
They are formed by condensation polymerization. |
3. |
They consist of polymers of smaller molecular weight. |
They consist of polymers of higher molecular weight. |
4. |
They are softer, weaker & less brittle. |
They are harder, stronger & more brittle. |
5. |
They have low tensile strength. |
They have high tensile strength. |
6. |
Their intermolecular bonds are weak. |
Their intermolecular bonds are strong covalent bonds. |
7. |
They soften on heating. |
They do not soften on heating. |
8. |
They are soluble in an organic solvent. |
They are insoluble in organic solvent. |
9. |
They can be reshaped and reused. |
They cannot be reshaped and reused. |
10. |
They can be reclaimed from the waste. |
They cannot be reclaimed from the waste. |
Examples: |
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Thermoplastic: Polyethylene, Polypropylene, PVC. |
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Thermosetting: Epoxy, Phenolic, Melamine. |