Polymer Technology
Mastication of rubber means

Its softening
A treatment to retard its deterioration due to oxidation
Improving its curing rate
Depression of its freezing point

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

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

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Polymer Technology
Elastomers are

Thermosetting material
Exemplified by protein derivatives
Having high flexural strength
Having very high tensile strength and heat resistance

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