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

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

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Polymer Technology
Epoxy resins (i.e., epoxide polymers)

Are made by addition polymerisation reaction only
Are cross-linked polymers only
Use emulsion polymerisation methods
Contain an epoxy group ( ##### ) at the ends of the polymer

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