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Back‐Biting Termination in Methyl Methacrylate/ tert‐ Butyl Acrylate Anionic Block Copolymerization
Author(s) -
Čadová Eva,
Dybal Jiří,
Kříž Jaroslav,
Vlček Petr,
Janata Miroslav,
Toman Luděk
Publication year - 2008
Publication title -
macromolecular chemistry and physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.57
H-Index - 112
eISSN - 1521-3935
pISSN - 1022-1352
DOI - 10.1002/macp.200800105
Subject(s) - copolymer , raman spectroscopy , methyl methacrylate , polymer chemistry , butyl acrylate , acrylate , block (permutation group theory) , chemistry , conjugated system , materials science , polymer , organic chemistry , physics , geometry , mathematics , optics
The product of spontaneous termination formed after addition of one or two t ‐BuA units onto living PMMA chains in the MMA /t ‐BuA block copolymerization was isolated and characterized by SEC, UV, FT‐IR, Raman and NMR spectroscopy. It appears as a low‐molecular‐weight peak in SEC eluograms of the copolymers, absorbing at 260 nm; its retention time corresponds to that of the PMMA block. In its FT‐IR and Raman spectra, new bands appeared corresponding to the CC and CO vibrations of a conjugated and H‐bonded ester group of the enol form of the cyclic oxoester composed of MMA and t ‐BuA units. Experimental support of a back‐biting reaction at the link between PMMA and P t ‐BuA blocks is presented.
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