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Inorganic Sulfites: Efficient Reducing Agents and Supplemental Activators for Atom Transfer Radical Polymerization
Carlos M R Abreu1, Patrícia V Mendonça1, Arménio C Serra2
1Department of Chemical Engineering, University of Coimbra, Polo II, Pinhal de Marrocos, 3030-790 Coimbra, Portugal.
Inorganic sulfites are effective reducing agents and supplemental activators for SARA ATRP of methyl acrylate. This eco-friendly approach yields polymers with controlled molecular weight and low dispersity.
Area of Science:
- Polymer Chemistry
- Organic Synthesis
Background:
- Atom Transfer Radical Polymerization (ATRP) is a controlled polymerization technique.
- Reducing agents are crucial for ATRP catalyst activation.
- Existing methods may have limitations in terms of efficiency or environmental impact.
Purpose of the Study:
- To investigate inorganic sulfites as reducing agents and supplemental activators for SARA ATRP.
- To evaluate the performance of sulfites in the polymerization of methyl acrylate.
- To assess the eco-friendly nature and commercial viability of using sulfites in ATRP.
Main Methods:
- Utilized sodium dithionite (Na2S2O4), sodium metabisulfite (Na2S2O5), and sodium bisulfite (NaHSO3) as reducing agents.
- Employed SARA ATRP conditions with Cu(II)Br2/Me6TREN in DMSO at ambient temperature.
- Characterized the resulting poly(methyl acrylate) for molecular weight and dispersity.
Main Results:
- Sulfites demonstrated high efficiency as both reducing agents and supplemental activators.
- Achieved controlled molecular weight and low dispersity (Mw/Mn = 1.05) for poly(methyl acrylate).
- Obtained polymers with well-defined chain-end functionality.
Conclusions:
- Inorganic sulfites are effective and eco-friendly reagents for SARA ATRP.
- This method offers a sustainable alternative for producing polymers with controlled characteristics.
- Sulfites' existing commercial applications and FDA approval support their use in industrial polymerization processes.
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