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The poly dispersity index (PDI) is for -...

The poly dispersity index `(PDI)` is for - natural polymers

A

unit

B

higher than unity

C

smaller than unity

D

higher of smaller than unity depending the nature of monomer

Text Solution

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The correct Answer is:
A
The `PDI` is unity (i.e., `overline(M_(w)) = overline(M_(n)))` for natural polymers as they are monodispersed. In synthetic polymers, which are always polydispersed, the `PDI` is greater than unity because `overline(M_(w))` is greater than unity
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Natural polymers are:

If overline(M)_(w) is the weight average molecular weight and overline(M)_(n) is the number average molecular weinght of a polyme, the poly dispersity index (PDI) of the polymer is given by

Statement 1: PDI (polydispersity index)of natural polymer is unity,while that of syntheric polymer is greater than unity Statement 2:Natural polymers are hemogeneous.

Which one is a natural polymer ?