AI Article Synopsis
- A novel method called thermo-regulated phase-separable catalysis (TPSC) is used for conducting copper(II)-mediated atom transfer radical polymerization (ATRP) of methyl methacrylate (MMA) in a dual solvent system (p-xylene and PEG-200).
- The process utilizes specific initiators and a catalyst that enable the solvents to mix when heated to 70 °C but separate again upon cooling to 25 °C, allowing easy removal of the catalyst from the final polymer product.
- The resulting PMMA (polymethyl methacrylate) exhibits controlled molecular weight and a narrow molecular weight distribution, showcasing the efficiency of the TPSC-based ICAR ATRP system.
Article Abstract
A strategy of thermo-regulated phase-separable catalysis (TPSC) is applied to the Cu(II)-mediated atom transfer radical polymerization (ATRP) of methyl methacrylate (MMA) in a p-xylene/PEG-200 biphasic system. Initiators for continuous activator regeneration ATRP (ICAR ATRP) are used to establish the TPSC-based ICAR ATRP system using water-soluble TPMA as a ligand, EBPA as an initiator, CuBr2 as a catalyst, and AIBN as a reducing agent. By heating to 70 °C, unlimited miscibility of both solvents is achieved and the polymerization can be carried out under homogeneous conditions; then on cooling to 25 °C, the mixture separates into two phases again. As a result, the catalyst complex remains in the PEG-200 phase while the obtained polymers stay in the p-xylene phase. The catalyst can therefore be removed from the resultant polymers by easily separating the two different layers and can be reused again. It is important that well-defined PMMA with a controlled molecular weight and narrow molecular weight distribution could be obtained using this TPSC-based ICAR ATRP system.
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| http://dx.doi.org/10.1002/marc.201400277 | DOI Listing |
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