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Polymers

Question
CBSEENCH12009355
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What do you mean by PDI? What does it tell us about a polymer?

Solution

PDI is poly disparity index defined as the ratio of the weight average and the number average molecular masses.
It is a very important parameter of polymers which is used to identify the disparity (anomaly) in the polymer. Natural polymers have PDI equal to one because in them the number of monomers in a chain are fixed and it does not change. But in case of synthetic polymers the PDI is greater than unity because the number of monomers does not remain same and are often more than the required amount.

Some More Questions From Polymers Chapter

Classify the following as addition and condensation polymers:
Terylene, Bakelite, Polyvinyl chloride, Polythene.

Explain the difference between Buna-N and Buna-S.

Arrange the following polymers in increasing order of their intermolecular forces.
Nylon 6, 6, Buna-S, Polythene.

Arrange the following polymers in increasing order of their intermolecular forces.
Nylon-6, Neoprene, Polyvinyl chloride.

Explain the terms polymer and monomer.

How do you explain the functionality of a monomer?

Define the term polymerization.

Is (NH—CHR—CO)n, a homopolymer or copolymer?

What is the basic unit of polymer called?

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