Whichof the followingpolymers of soften on heatingand hardenon cooling – InterviewSolution

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1.	Whichof the followingpolymers of soften on heatingand hardenon cooling? Whatare the polymers with thisproperty collectively called ? What are the structural similarities between such polymers ?
Answer» Solution :Polythene , polyvinyls and POLYSTYRENE softenon heatingand HARDEN on cooling . Suchpolymers and calledthermoplastic POLYMERS . Thesepolymers are linearor slightly BRANCHED long chain moleculues . Theypossess intermolecular forces whosestrenghtlies betweenstrenghtofintermolecular forcesof elastomersand fibres .

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