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
Dear Philipp Selenschik, since you have both Mn of the two polymers, they Can be used in comparing them. However, in most cases MW is only a rough approximation parameter, other factors are more governing the behavior such as functional groups in the main chain, chain architecture, stiffness, flexibility, spatial arrengements, entanglements, and so on. My Regards
Dear Philipp Selenschik, since you have both Mn of the two polymers, they Can be used in comparing them. However, in most cases MW is only a rough approximation parameter, other factors are more governing the behavior such as functional groups in the main chain, chain architecture, stiffness, flexibility, spatial arrengements, entanglements, and so on. My Regards
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