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• W2000925036 abstract "Abstract End‐groups of poly(methyl methacrylate) from radical solution polymerization of MMA using tert ‐butyl peroxyacetate (TBPA), tert ‐amyl peroxyacetate (TAPA), 1,1,2,2‐ tetramethylpropyl peroxyacetate (TMPPA), and 1,1,3,3‐tetramethylbutyl peroxyacetate (TMBPA) as the initiators were analyzed via electrospray ionization mass spectrometry (ESI‐MS). The type and the relative concentration of the radical species, which actually initiate macromolecular growth, are determined. In the majority of cases, these species differ from the primary radicals from thermal decomposition of the peroxyacetates. Fourier‐transform ion cyclotron resonance mass spectrometry (FT‐ICR MS) was applied for unambiguous peak assignment. The methylcarbonyloxyl radical, which is formed by the decomposition of all peroxyacetates, was found to undergo decarboxylation yielding an initiating methyl radical. TAPA‐ and TMPPA‐derived alkoxyl radicals mainly show β‐scission, TMBPA‐derived alkoxyl radicals additionally undergo a 1,5‐hydrogen‐shift reaction. The tert ‐butoxyl radicals produced from TBPA undergo pronounced chain‐transfer reaction prior to their decomposition into methyl radicals and acetone. In the case of using benzene as a relatively inert solvent, the tert ‐butoxyl radicals exhibit transfer to monomer yielding polymer molecules, which do not carry any initiator‐derived end‐groups. By using mesitylene as a cosolvent, small amounts of star polymer were generated via multiple hydrogen abstraction by tert ‐butoxyl radicals from the three individual methyl groups of mesitylene. This uncomplicated procedure of modification of end‐group and polymer topology may be attractive for facile adjustment of polymer viscosity in technical processes. © 2007 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 45: 2453–2467, 2007" @default.
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• W2000925036 date "2007-05-14" @default.
• W2000925036 modified "2023-10-18" @default.
• W2000925036 title "Initiation of radical polymerization by peroxyacetates: Polymer end-group analysis by electrospray ionization mass spectrometry" @default.
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• W2000925036 doi "https://doi.org/10.1002/pola.22008" @default.
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