Polymer Technology
Branched chair polymers as compared to linear polymers have

Lower density
Higher tensile strength
None of these
Higher melting point

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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
Increase its viscosity
Reduce the time of vulcanisation and quantity of vulcanising agent
Reduce its viscosity to permit easier processing

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