Polymer Technology
Pick out the wrong statement regarding the solubility characteristics of high polymers.

High molecul ar weight polymers on dissolving gives solution of very low viscosity
Polymers having more aliphatic character are more soluble in aliphatic solvents, while those polymers having more aromatic character are more soluble in aromatic solvents
Greater the degree of cross-linking in the polymer, lesser is its solubility
Swelling tendency or solubility of polymers in a particular solvent decreases with increase in molecular weight of the solvent

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

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