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Introduction to Polymer Chemistry — Chemistry STD 12 Science — Question

Maharashtra BoardEnglish MediumSTD 12 ScienceChemistryIntroduction to Polymer Chemistry4 Marks
Question
Distinguish between thermosetting and thermoplastic resins. Write example of both the classes.
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Answer

Thermosetting resinThermoplastic resin
(1) They harden when heated. Once hardened it no longer melts.(1) They soften when heated and harden again when cooled.
(2) They cannot be re-shaped.(2) They can be reshaped
(3) They are strong, hard.(3) They are weak, soft.
(4) Thermosetting resin show cross-linking.
Examples : Melamine resin Epoxy resins, Bake-lite.		(4) Thermoplastic molecules do not cross link, hence are flexible.
Examples : Polythene, polypropylene, nylon, polyester.

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