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AP EAMCET2008ChemistrySome Basic Concepts of Chemistry

If M _w is the weight average molecular weight and M _n is the number average molecular weight of a polymer, the poly dispersity index (PDI) of the polymer is given by

Options

  1. AM _n M _w
  2. BM _w M _n
  3. CM _w M _n
  4. D1 M _w M _n

Correct answer

B. M _w M _n

Step-by-step solution

The ratio of weight average molecular weight and the number average molecular weight is called poly dispersity index (PDI). PDI = M _w M _n where, M _w= weight average molecular weight M _n= number average molecular weight PDI is unity for natural monodispersed polymer but for synthetic polymers it is always greater than unity.

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