End groups of poly(methyl methacrylate) as a function of molecular weight determined by pyrolysis-gas chromatography.

概要

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End groups of poly(methyl methacrylate) (PMMA) radically polymerized with benzoyl peroxide (initiator) in toluene solution were investigated by pyrolysis gas chromatography as a function of molecular weight. The number-average molecular weights (\barMn) of fractionated PMMA samples were estimated from the relative peak intensities of characteristic pyrolysis products and were compared with those determined by size exclusion chromatography. The observed result suggested that the chain transfer reactions to the monomer might yield relatively smaller PMMA molecules. Furthermore, the relative peak intensities among aromatic products which reflect three kinds of aromatic chain ends were correlated to the (\barMn) of the fractionated PMMAs. The result suggested that the chain transfer reaction to the solvent also tended to yield relatively smaller PMMA molecules whereas the polymerization initiated by the phenyl radical from the initiator yielded relatively larger PMMA molecules under given polymerization conditions.
公益社団法人日本化学会の論文