原子转移自由基聚合
分散性
化学
聚合
催化作用
高分子化学
溴化物
金属
聚合物
自由基聚合
化学工程
有机化学
工程类
作者
Qiangbing Wei,Mingkang Sun,Francesca Lorandi,Rongguan Yin,Jiajun Yan,Tong Liu,Tomasz Kowalewski,Krzysztof Matyjaszewski
出处
期刊:Macromolecules
[American Chemical Society]
日期:2021-02-03
卷期号:54 (4): 1631-1638
被引量:24
标识
DOI:10.1021/acs.macromol.0c02702
摘要
Micro/nanodroplets of the liquid metal (LM) eutectic Ga–In alloy (EGaIn) were employed in atom transfer radical polymerization (ATRP) in organic solvents with low ppm (parts per million) loading of Cu catalysts. ATRP in the presence of EGaIn produced well-defined polymers (dispersity <1.1) that could be easily separated from EGaIn via centrifugation. Voltammetric analysis revealed that EGaIn micro/nanodroplets reduced CuII complexes to CuI complexes, which acted as ATRP activators. A key distinction from previously reported LM-mediated radical polymerizations is that this process did not require external forces, such as ultrasound sonication. EGaIn droplets also activated dormant alkyl bromide species. However, this reaction was ∼6 orders of magnitude slower than the corresponding activation by CuI complexes, resembling SARA (supplemental activators and reducing agents) ATRP.
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