Abstract
End groups of poly(methyl methacrylate) (PMMA) radically polymerized with benzoyl peroxide (initiator) in toluene solution were investigated by pyrolysis-gas chromatography. Various characteristic pyrolysis products reflecting the possible chain ends in the PMMA samples were observed on the resulting pyrograms. First of all, the number-average molecular weights of the PMMA samples were estimated from the relative peak intensities of aromatic pyrolysis products formed from the initiator- or solvent-incorporating chain ends. Furthermore, the relationships between the relative peak intensities of the characteristic aromatic products and the polymerization conditions such as polymerization temperature and solvent/ monomer ratio were successfully interpreted in terms of initiation, propagation and chain transfer reactions in solution polymerization of MMA.
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