Polymer Technology
Nylon-66 compared to nylon-6 has

All of these
Lower melting point
More abrasion resistant properties
Higher hardness

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

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

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