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Studies on the application of matrix‐assisted‐laser‐desorption‐ionisation time‐of‐flight mass spectrometry to the determination of chain transfer coefficients in free radical polymerization
Author(s) -
Kapfenstein Heidi M.,
Davis Thomas P.
Publication year - 1998
Publication title -
macromolecular chemistry and physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.57
H-Index - 112
eISSN - 1521-3935
pISSN - 1022-1352
DOI - 10.1002/(sici)1521-3935(19981101)199:11<2403::aid-macp2403>3.0.co;2-9
Subject(s) - mass spectrometry , chemistry , desorption , chain transfer , polymerization , matrix (chemical analysis) , polymer chemistry , radical polymerization , time of flight mass spectrometry , ionization , analytical chemistry (journal) , polymer , organic chemistry , chromatography , ion , adsorption
The chain transfer coefficient ( C s ) has been determined for 2‐methyl‐2‐propanethiol (t‐Bu‐SH) in the solution polymerization of methyl methacrylate (MMA). Three different analytical methods were investigated. The Mayo and chain length distribution (CLD) methods yielded consistent C s values of 0.12 and 0.13, respectively, at 60°C. A third, new approach to the evaluation of C s values was also attempted using Matrix‐Assisted‐Laser‐Desorption‐Ionisation (MALDI) Time‐Of‐Flight Mass Spectrometry to analyse the end‐groups of the polymer chains. The values of C s obtained from MALDI analyses were not consistent with the other two methods and the relative intensities of the peaks with different end‐groups were found to be dependent on the selection of cation.