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Poly(methyl
methacrylate) and Poly(styrene) Tandem
mass spectrometry (MS/MS) has long been used to provide additional structural
information that is not readily available from single mass spectrometric
analyses. In MS/MS experiments, the ion of interest is mass selected and
then intentionally fragmented, via collisions with an inert gas (CID)
or the ion may have enough internal energy to fragment on its own. The
resulting fragments are then mass analyzed. For synthetic polymers, MS/MS
experiments have been used to identify end groups, determine the sequence
of copolymers, investigate the structures of monomers, etc.
These polymers
don't appear to have much in common but they have very similar CID fragmentation
spectra. Ion mobility measurements and molecular modeling calculations
were used to determine the conformations and polymer-alkali cation binding
properties to help explain the CID spectra and propose mechanisms for
the fragmentation process.
More detailed information can be found in:
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