Question

why thermoplastics become soft on heating but thermosetting plastics do not become soft on heating

Answer 1

answer: Thermoplastics can be softened by heat but thermosetting plastics cannot be softened by heat. This is due to the difference in their structure. ... Due to this, on heating, the individual polymer chains can slide over one another and thermoplasticmaterial becomes soft and ultimately melts.

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Answer 2

polymer chains in thermoplastic (like polythene) Are linear having no cross link