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Polymer molecular weight distribution: Results from matrix‐assisted laser desorption ionization compared with those from gel‐permeation chromatography
Author(s) -
Lehrle Roy S.,
Sarson Deborah S.
Publication year - 1995
Publication title -
rapid communications in mass spectrometry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.528
H-Index - 136
eISSN - 1097-0231
pISSN - 0951-4198
DOI - 10.1002/rcm.1290090119
Subject(s) - chemistry , molar mass distribution , gel permeation chromatography , analytical chemistry (journal) , polymer , desorption , ionization , chromatography , matrix (chemical analysis) , methyl methacrylate , matrix assisted laser desorption/ionization , organic chemistry , adsorption , ion , monomer
A sample of poly(methyl methacrylate) (PMMA), of which the molecular weight was known from light‐scattering measurements, was subjected to gel‐perrneation‐chromatographic analysis, and the resulting Weight versus log molecular weight (MW) plot was converted by suitable computation to a Number versus linear MW plot. This could then be compared directly with the matrix‐assisted laser desorption ionization MW distribution results obtained for the same sample. The MW distributions obtained by the two methods were significantly different. Two explanations for the discrepancy are offered.