Polymer Technology
Thermosplastic materials

None of these
Are heavily branched molecules
Do not soften on application of heat
Are solvent insoluble

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Polymer Technology
Peptizers like aromatic mercaptans (e.g. thiophenes) are added in rubber to

Protect rubber goods from attack by oxygen & ozone present in the atmosphere
Reduce its viscosity to permit easier processing
Increase its viscosity
Reduce the time of vulcanisation and quantity of vulcanising agent

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