Matrix-assisted laser desorption/ionization time-of-flight mass spectrometry analysis of poly(para-phenyleneethynylene)s

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For the first time, MALDI-TOF MS was utilized for the determination of the structures of four partially soluble poly(p-phenyleneethynylene)s (PPEs) used to disperse single-walled carbon nanotubes in polymers. The spectra obtained indicated that the synthesis of the PPEs resulted in the formation of a co-oligomer with two different repeat groups. Various methods were employed to obtain an optimum spectrum. The evaporation-grinding sample preparation method (E-G method) combined with dithranol as matrix and KTFA as cationizing agent appeared to be the best method for obtaining a MALDI-TOF MS spectrum. AgTFA was the most effective cationizing agent for one sample that contained a high carbon-to-oxygen ratio. Copyright © Taylor & Francis LLC.

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International Journal of Polymer Analysis and Characterization