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प्रश्न
Answer the following.
Distinguish between thermosetting and thermoplastic resins. Write example of both the classes.
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उत्तर
| Thermosetting resin | Thermoplastic resin |
| They do not soften on heating | They soften on heating and harden on cooling |
| They cannot be remoulded or reshaped. | These can be remoulded or reshaped. |
| They possess extensive cross-linking formed by covalent bonds. | They possess moderately strong intermolecular forces that are intermediate between elastomers and fibres. |
| They are rigid polymers. | They are not rigid polymers. |
| e.g. Bakelite, urea-formaldehyde resins, etc. | e.g. PVC, polythene, polystyrene, etc. |
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\[\begin{array}{cc}
\ce{-(CH2 - CH2 - CH - CH2 - CH2)_\text{n}}\\
|\phantom{..}\\\ce{\phantom{..}CH2}\\
|\phantom{..}\\\ce{\phantom{..}CH2}\end{array}\]
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