Polymer Technology
Condensation polymerisation of __________ produces bakelite.

Propylene
Phenol & formaldehyde
Urea & formaldehyde
Phenol & acetaldehyde

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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
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

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