Determine the polydispersity index for polystyrene having the following molecular weight distributions:

Question

Question

Determine the polydispersity index for polystyrene

Answer 1

Answer #1

The polydispersity index is the ratio of Molecular weight averages.

Polydispersity Index (PDI ) = $\tiny \sum$ Mw / $\tiny \sum$ Mn

PDI = ( 5000 + 7000 + 9000 + 11000 + 13000) / ( 2+15+17+12+4)

= 45000 / 50

= 900

Answer ; (PDI ) = 900

Answer 2

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