Abstract
Atom transfer radical polymerization (ATRP) of methyl, butyl and tert-butyl acrylates was studied at conditions when low molecular weight polymers (Mn ≅ 2·103) are formed, i. e., at relatively high concentration of initiator (ethyl 2-bromopropionate) and catalyst (CuBr/amine). MALDI TOF analysis of the polymer samples isolated at different stages of polymerization revealed that in the course of polymerization potentially active macromolecules terminated with bromine are gradually converted into inactive macromolecules devoid of terminal bromine. A possible transfer mechanism, involving amine is a component of the catalytic system, is proposed. It was shown that quantitative analysis of the MALDI TOF spectra allows one to estimate the ratio of apparent rate constants of propagation and degradative transfer, providing quantitative information to what extent the system conforms to the contolled polymerization scheme.
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