Polymer Technology
Identify the group in which all the polymers mentioned can be used to make fibres.

Cellulose derivatives, Polyisoprene, Polyethylene
Butadiene copolymers, Polyamides, Urea aldehyde
Polypropylene, Poly vinyl chloride, Silicon
Cellulose derivatives, Polyamides, Polyurathane

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

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

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