Abstract
Matrix-assisted laser desorption/ionization mass spectrometry (MS) has been shown to provide most probable peak (Mp) values for poly(methyl methacrylate) polymers that are low relative to manufacturers, Mp values measured by size exclusion chromatography (SEC). Comparison of theoretical Mp values determined by MS or SEC is shown to be a function of how the data are displayed. For narrow polymer distributions, the theoretical Mp value determined by MS will be 2 monomer units smaller than the Mp determined by SEC. For wide polydispersity, the Mp value determined by MS will be considerably lower than those obtained from SEC. The Mp value reported should be reserved for weight fraction vs log mass plots as in SEC. The modal molecular mass, Mm, is recommended for data represented as number fraction vs linear mass as with MS data.
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