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Self‐degassing SARA ATRP mediated by Na2S2O4 with no external additives
Journal of Polymer Science Part A: Polymer Chemistry Pub Date : 2019-09-05 , DOI: 10.1002/pola.29484
Andreia S. R. Oliveira 1 , Patrícia V. Mendonça 1 , Arménio C. Serra 1 , Jorge F. J. Coelho 1
Affiliation  

The supplemental activator and reducing agent (SARA) atom transfer radical polymerization (ATRP) mediated by Na2S2O4 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 Na2S2O4 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., Part A: Polym. Chem. 2019

中文翻译:

Na 2 S 2 O 4介导的自脱气SARA ATRP ,无外部添加剂

据报道,在一些空气中,Na 2 S 2 O 4在没有外部脱氧或其他除氧剂的情况下,由Na 2 S 2 O 4介导的辅助活化剂和还原剂(SARA)原子转移自由基聚合(ATRP)对于丙烯酸乙烯基酯(MA) ,丙烯酸丁酯(n- BA),甲基丙烯酸甲酯(MMA),甲基丙烯酸2-(二甲氨基)乙酯(DMAEMA),聚乙二醇(甲基乙二醇)甲基醚丙烯酸酯(OEOA)和苯乙烯(Sty)。聚合反应可以在含水介质中或使用有机/水混合物作为溶剂,室温下铜浓度低的条件下进行。在没有任何外部脱氧的情况下,获得了几种定义明确的均聚物和嵌段共聚物(Ð  <1.3)。用光学氧气传感器监测聚合过程中氧气浓度的变化。乙醇/水混合物中聚合前氧气的消耗归因于Na 2 S 2 O 4和烷基卤化物引发剂的共同存在,这导致较低的引发效率(I eff)。这可以通过减少反应的顶空体积来克服。报告的系统显示出可扩展的潜力,这从工业角度来看非常相关。分级为4 +©2019 Wiley Periodicals,Inc.J.Polym。科学,A部分:Polym。化学 2019年
更新日期:2019-09-05
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