Journal
MACROMOLECULAR RAPID COMMUNICATIONS
Volume 35, Issue 18, Pages 1615-1621Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/marc.201400277
Keywords
ATRP; heterogeneous separation; homogeneous catalysis; recycling; thermo-regulated phase-separable catalysis (TPSC)
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Funding
- National Natural Science Foundation of China [21174096, 21274100, 21234005]
- Project of Science and Technology Development Planning of Suzhou [ZXG201413, SYG201430]
- Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD)
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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 degrees C, unlimited miscibility of both solvents is achieved and the polymerization can be carried out under homogeneous conditions; then on cooling to 25 degrees 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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