Which of the following polymers soften on heating and harden on cooling: What are the polymers with this property collectively called? What are the structural similarities between such polymers? Bakelite, urea-formaldehyde resin, polythene, polyvinyl, polystyrene.
Polythene, polyvinyls, and polystyrene soften on heating and harden on cooling. Such polymers are called thermoplastic pOlymers. these polymers are a linear array of slightly branched long-chain molecules.
These possess intermolecular forces whose strength lies between the strength of intermolecular forces of elastomers and fibers while bakelite, urea-formaldehyde resin are thermosetting polymers which on heating undergo extensive cross-linking in molds and again become infusible.
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