Direct observation of cobalt-carbon bond formation in thé catalytic chain transfer polymerization of methyl acrylate using matrix-assisted laser desorption lonization time-of-flight mass spectrometry

G. Evan Roberts, Johan P.A. Heuts, Thomas P. Davis

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37 Citations (Scopus)

Abstract

A preliminary study into the mechanism of catalytic chain transfer polymerization of methyl acrylate with BF2-bridged cobaloxime is reported. The reaction kinetics indicate two distinct phases of the reaction: an induction time followed by a steady-state polymerization. In the polymerization phase chain transfer occurs. Low molecular weight polymer chains formed during the induction period were isolated and analyzed by matrix-assisted laser desorption ionization time-of-flight mass spectrometry (MALDI). The MALDI spectra clearly indicated poly(methyl acrylate) chains bound to a single cobaloxime molecule. The poly(methyl acrylate)-Co chains were then further reacted with a-methylstyrene at 60 °C. MALDI analyses of the polymer from the second reaction stage indicated a displacement of cobaloxime from the chain end by an a-methylstyrene unit.

Original languageEnglish
Pages (from-to)7765-7768
Number of pages4
JournalMacromolecules
Volume33
Issue number21
Publication statusPublished - 17 Oct 2000
Externally publishedYes

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