What is PDI (Poly Dispersity Index ) ?

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.

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.

The PDI (polydispersity index) is the ratio of weight to number-average molecular masses (Mbar(w))//(M(bar(n)) .In natural polymers,which are generally monodispersed, PDI is………and in synthetic polymers which are always polydispersed, PDI is …….. because Mbar(w) is always .......than Mbar(n) .

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

If M_w is the weight-average molecular weight and M_n is the number, the poly dispersity index (PDI)of the polymer is given by

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

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