Hello,

I spin-cast two different polymers onto wafers and measure their height as a function of initial concentration. For polymer A, I have the weight-average molecular weight (Mw) as well as the polydispersity index (PDI) and can thus calculate Mn. For polymer B, I only know the number-average molecular weight (Mn). Now I wonder: is it acceptable to calculate the concentration based on Mn, e.g. n = m/Mn and than c = n/V as usual for Mw?

Otherwise I'd give the mass concentration, but that renders the comparison between A + B impossible. What do you think?

Best,

Philipp

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