Question

Q.5. Explain why thermoplastics become soft on heating but thermosetting plastics do not become soft on heating.

Answer 1

Hi,
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Here is your answer,
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The main reason behind it is that thermosetting plastics are the polymers in which chains get highly cross-linked on heating, while thermoplastic have long chain polymers with no cross-linking .Heating also does not produce any cross-linking between the chain. This results for easy melting of thermoplastic.

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HOPE YOU WILL UNDERSTAND MY WORDS, a request is here please as I am an ACE ranker I wish that to make my way easy for the GENIUS rank you should mark my answer brainlest if you wish then only ☺.
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Answer 2

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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 thermoplastic material becomes soft and ultimately melts.