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http://hdl.handle.net/1942/28828
Title: | Mapping Dithiobenzoate-Mediated RAFT Polymerization Products via Online Microreactor/Mass Spectrometry Monitoring | Authors: | HAVEN, Joris JUNKERS, Tanja |
Issue Date: | 2018 | Publisher: | MDPI | Source: | POLYMERS, 10(11) (Art N° 1228) | Abstract: | 2-cyano-2-propyl dithiobenzoates (CPDB)-mediated reversible addition-fragmentation chain transfer (RAFT) polymerization was monitored by online flow microreactor/mass spectrometry. This enabled the reactions to be followed in a time-resolved manner, closely resolving product patterns in the reaction mixtures at any point in time. RAFT polymerization was investigated for low RAFT to monomer ratios, enabling the monitoring of the early stages of a typical RAFT polymerization. The expected transition from pre- to the RAFT main equilibrium is observed. However, very high abundancies for cross-termination products were also identified, both in the pre- and main equilibrium stage. This is a somewhat surprising result as such products have always been expected, but to date have not been observed in the majority of studies. Product isolation and NMR analysis revealed that cross-termination occurs in the para position of the benzoate ring and becomes fully irreversible via re-aromatization of the ring in a H-shift reaction. The present data suggest a pronounced chain-length dependence of the cross-termination reaction, which would explain why the products are seen here, but not in other studies. | Notes: | [Haven, Joris J.; Junkers, Tanja] Monash Univ, Sch Chem, Polymer React Design Grp, 19 Rainforest Walk, Clayton, Vic 3800, Australia. [Junkers, Tanja] Hasselt Univ, Inst Mat Res, Martelarenlaan 42, B-3500 Hasselt, Belgium. | Keywords: | online monitoring; flow polymerizations; dithiobenzoate-mediated RAFT polymerization; mass spectrometry; cross-termination;online monitoring; flow polymerizations; dithiobenzoate-mediated RAFT polymerization; mass spectrometry; cross-termination | Document URI: | http://hdl.handle.net/1942/28828 | e-ISSN: | 2073-4360 | DOI: | 10.3390/polym10111228 | ISI #: | 000454456800050 | Rights: | 2018 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/). | Category: | A1 | Type: | Journal Contribution |
Appears in Collections: | Research publications |
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