Polymer Technology
Synthetic rubber

Is highly permeable to air & water and is readily attacked by chemicals & atmospheric gases
Deforms, if stretched to double of its original dimension
Is softer at higher temperature
Is brittle at low temperature

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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
Greater the degree of cross-linking in the polymer, lesser is its solubility
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

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