Chemical Engineering MCQs

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.

Swelling tendency or solubility of polymers in a particular solvent decreases with increase in molecular weight of the solvent.

High molecul ar weight polymers on dissolving gives solution of very low viscosity.

sebasic acid

terephthalic acid

adipic acid

benzoic acid

Plastics are good conductors of heat and electricity.

All the polymers are highly crystalline in nature

Polymers can be vaporised by heating to a very high temperature.

The liquid polymer becomes greasy, then waxy and finally solid on increasing the degree of polymerisation.

a thermosetting material.

a condensation polymerisation product.

made by employing emulsion polymerisation.

none of these.

protect rubber goods from attack by oxygen & ozone present in the atmosphere.

reduce its viscosity to permit easier processing.

reduce the time of vulcanisation and quantity of vulcanising agent.

increase its viscosity.