Differentiate between thermosetting and thermo-softening plastics.
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Thermosetting
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Thermo-softening
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1. The plastics who possess three dimensional complicated structure with cross linkages are called as thermo setting plastics
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1. The plastics who possess linear long chain structure without cross linkages are called as thermo softening plastics
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2. They are formed by condensation polymerization
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2. They are formed by addition polymerization
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3. They consist of polymers of higher molecular weight
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3. They consist of polymers of smaller molecular weight
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4. They are harder, stronger & more brittle
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4. They are softer, weaker &less brittle
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5. They have high tensile strength
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5. They have low tensile strength
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6. Their inter molecular bonds are strong covalent bonds
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6. Their inter molecular bonds are weak
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7. They do not soften on heating
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7. They soften on heating
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8. They are insoluble in organic solvent
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8. They are soluble in organic solvent
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9. They cannot be reshaped and reused
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9. They can be reshaped and reused
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10. They cannot be reclaimed from the waste
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10. They can be reclaimed from the waste
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11. Examples- Bakelite, Polyester, Nylon66, Urea formaldehyde, Silicon plastic
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11. Examples- Polythene, Polystyrene, PVC, Teflon
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