Self‐degassing SARA ATRP mediated by Na2S2O4 with no external additives. Issue 1 (2nd January 2020)

• Record Type: Journal Article
• Authors: Oliveira, Andreia S. R.; Mendonça, Patrícia V.; Serra, Arménio C.; Coelho, Jorge F. J.
• Is Part Of: Journal of polymer science. Volume 58:Issue 1(2020)
• Page Start: 145
• Page End: 153
• Publication Date: 2020-01-02
• Subjects: atom transfer radical polymerization -- block copolymers -- inorganic sulfites -- oxygen -- reaction mechanisms; Polymers -- Periodicals; Polymerization -- Periodicals; Polymerization; Polymers; Periodicals; 547.7
• DOI: 10.1002/pol.20190298
• Languages: English
• ISSNs: 2642-4150

Abstract

ABSTRACT: The supplemental activator and reducing agent (SARA) atom transfer radical polymerization (ATRP) mediated by Na2 S2 O4 in the presence of air, without external deoxygenation or additional oxygen scavengers, is reported for several vinyl monomers: methyl acrylate (MA), n ‐butyl acrylate ( n ‐BA), methyl methacrylate (MMA), 2‐(dimethylamino)ethyl methacrylate (DMAEMA), poly(ethylene glycol) methyl ether acrylate (OEOA), and styrene (Sty). The polymerizations can be conducted in aqueous medium or using organic/water mixtures as solvent, with low concentration of copper, near room temperature. In the absence of any external deoxygenation, several well‐defined homopolymers and block copolymers were obtained ( Ð < 1.3). The evolution of the oxygen concentration during the polymerizations was monitored with an optical oxygen sensor. The consumption of oxygen prior polymerization in ethanol/water mixtures was attributed to the combined presence of Na2 S2 O4 and alkyl halide initiator, which led to a lower initiation efficiency (Ieff ). This could be overcome by decreasing the headspace volume of the reaction. The system reported exhibited the potential to be scalable, which is very relevant from an industrial standpoint. © 2019 Wiley Periodicals, Inc. J. Polym. Sci. 2020, 58, 145–153 Abstract : The SARA ATRP mediated by Na2 S2 O4 in the presence of air, without external deoxygenation or additional oxygen scavengers, is reported for several vinyl monomers: methyl acrylate (MA), n ‐butyl acrylate ( n ‐BA), methyl methacrylate (MMA), 2‐(dimethylamino)ethyl methacrylate (DMAEMA), poly(ethylene glycol) methyl ether acrylate (OEOA), and styrene (Sty). The polymerizations can be conducted in aqueous medium or using organic/water mixtures as solvents, with low concentration of copper, near room temperature.