The poly dispersity index (PDI) of a polymer is (`overline(M_(w))` = weight average molecular mass and `overline(M_(n))` number average molecular mass)

Options

A. the product of `overline(M_(n))` and `overline(M_(w))`
B. the sum of `overline(M_(n))` and `overline(M_(w))`
C. the difference between `overline(M_(w))` and `overline(M_(n))`
D. the ratio between `overline(M_(w))` and `overline(M_(n))`

Answer

d

Explanation

The polydispersity index (PDF) of a polymer is the ratio of `overline(M_(w))` and `overline(M_(n))`
`PDI = (overline(M_(w)))/(overline((m_(2n)))`
It is directly related to the standard deviation of polymer molecular weigth distribution. polydispersity index can be used as a measure of the width of the molecular mass distribution