Polymer Technology
Condensation of bisphenol A with phosgene produces __________ which possess very good heat resistance.

Polycarbonate
Polyurathane
Polysulphone
Polyester

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Polymer Technology
Polyvinyl chloride (PVC)

Can be made thermosetting by adding a plasticiser
Softening temperature is 200°C
Is produced by polycondensation reaction
Uses either emulsion or suspension polymerisation methods

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

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