TS EAMCET · Chemistry · Polymers
The poly dispersity index (PDI) of a polymer is ( \(\bar{M}_W=\) weight average molecular mass and \(\bar{M}_n=\) number average molecular mass)
- A the product of \(\bar{M}_n\) and \(\bar{M}_w\)
- B the sum of \(\bar{M}_n\) and \(\bar{M}_w\)
- C the difference between \(\bar{M}_w\) and \(\bar{M}_n\)
- D the ratio between \(\bar{M}_w\) and \(\bar{M}_n\)
Answer & Solution
Correct Answer
(D) the ratio between \(\bar{M}_w\) and \(\bar{M}_n\)
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Detailed explanation
The polydispersity index (PDl) of a polymer is the ratio of \(\bar{M}_w\) and \(\bar{M}_n\). \[ \mathrm{PDI}=\frac{\bar{M}_w}{\bar{M}_n} \] It is directly related to the standard deviation of polymer molecular weight distribution. Polydispersity index can be used as a measure of…
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