Molecular weight of a polymer is equal to the molecular weight of the repeat unit multiplied by the degree of polymerisation. What is the molecular weight of poly vinyl chloride (PVC), if its degree of polymerisation is 800 ?

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Styrene butadiene rubber (SBR) as compared to natural rubber has_______________?

A. Poor tensile strength B. Poorer resistance C. Greater amount of heat build up heavy loading D. All A., B. and C....

Viscosity of a polymer solution or melt _________________?

A. Decreases with increase in molecular weight B. Decreases with increase in temperature C. Increases with increase in temperature D. Does not vary with temperature rise...

Peptizers like aromatic mercaptans (e.g. thiophenes) are added in rubber to _________________?

A. Protect rubber goods from attack by oxygen & ozone present in the atmosphere B. Reduce its viscosity to permit easier processing C. Reduce the time of vulcanisation and quantity of vulcanising agent D. Increase its viscosity...

In condensation polymerisation as compared to addition polymerisation____________________?

A. The monomers are unsaturated compounds B. No co-product is lost C. The monomers contain two functional groups D. Generally only one monomer is involved...

_______________ is normally used for the manufacture of refrigerator components and transistor parts?

A. Polypropylene B. Polystyrene C. Polyester D. Polyurethane...