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MALDI-TOF MS analysis of the self-termination products in the anionic methyl methacrylate/tert-butyl acrylate block copolymerization
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SYSNO ASEP 0446686 Druh ASEP J - Článek v odborném periodiku Zařazení RIV J - Článek v odborném periodiku Poddruh J Článek ve WOS Název MALDI-TOF MS analysis of the self-termination products in the anionic methyl methacrylate/tert-butyl acrylate block copolymerization Tvůrce(i) Vlček, Petr (UMCH-V) RID
Čadová, Eva (UMCH-V) RID
Horský, Jiří (UMCH-V) RID, ORCID
Janata, Miroslav (UMCH-V) RIDZdroj.dok. Polymer Bulletin. - : Springer - ISSN 0170-0839
Roč. 72, č. 9 (2015), s. 2227-2239Poč.str. 13 s. Jazyk dok. eng - angličtina Země vyd. DE - Německo Klíč. slova anionic polymerization ; acrylates ; block copolymer Vědní obor RIV CD - Makromolekulární chemie Institucionální podpora UMCH-V - RVO:61389013 UT WOS 000359832200008 EID SCOPUS 84939464304 DOI 10.1007/s00289-015-1400-x Anotace The p(MMA-b-t-BuA) copolymer was prepared using the initiation system methyl 2-lithioisobutyrate/lithium/tert-butoxide (MIB-Li/t-BuOLi). A low-molecular-weight fraction was isolated and analyzed by MALDI-TOF mass spectrometry with the aim to find out structures of products of self-termination, which proceeds mainly after the addition of t-BuA into the living PMMA. The main self-termination products are formed after addition of one or two t-BuA units onto living PMMA-Li by backbiting reaction of t-BuA-Li chain-ends and carbonyl group of the antepenultimate MMA units of the same chain. The oxoesters generated in this way contain hydroxygroup, and its hydrogen can protonize any of the living chains, regardless of the type of its terminal unit. Signals of the chains, terminated by this protonization, have also been found in the spectra. Thus, the first direct evidences for the structures of the self-termination products in the anionic methacrylate/acrylate block copolymerization were obtained in this way. Pracoviště Ústav makromolekulární chemie Kontakt Eva Čechová, cechova@imc.cas.cz ; Tel.: 296 809 358 Rok sběru 2016
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