Answer:
Polythene,
polyvinyl (PVC, teflon, acrilan, etc.), polystyrene soften on heating and,
harden on cooling.
Such polymers are called thermoplastic polymers. These polymers
are linear or slightly brnached long chain molecules. Their intermolecular
forces of attraction lie in between those of elastomers and fibres. For further
details, refer to sec. 15.5.4, page 15/7.
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