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Back-Biting Termination in Methyl Methacrylate/tert-Butyl Acrylate Anionic Block Copolymerization

✍ Scribed by Eva Čadová; Jiří Dybal; Jaroslav Kříž; Petr Vlček; Miroslav Janata; Luděk Toman

Book ID
102486643
Publisher
John Wiley and Sons
Year
2008
Tongue
English
Weight
294 KB
Volume
209
Category
Article
ISSN
1022-1352

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✦ Synopsis

Abstract

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 CC and CO 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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Poly(methyl methacrylate-b-n-butyl acrylate) (PMMA-b-Pn-BuA) and poly(methyl methacrylate-b-n-nonyl acrylate) (PMMA-b-Pn-NonA) diblock copolymers have been successfully synthesized by the sequential anionic polymerization of methyl methacrylate (MMA) and the n-alkyl acrylate (n-BuA or n-NonA), in a