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À propos de : Use of JandaJel Resins for Copper Removal in Atom Transfer RadicalPolymerization        

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  • Use of JandaJel Resins for Copper Removal in Atom Transfer RadicalPolymerization
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  • Atom transfer radical polymerization (ATRP) ligands were supported onto JandaJel resinsto allow for easy removal of the catalyst complex from the reaction mixture. Compared to divinylbenzenecross-linked resins, JandaJels have increased organic solvent compatibility and site accessibility due tothe flexible cross-linker. These resins were chosen as the support in an attempt to obtain fast reactiontimes, good molecular weight control, and narrow polydispersity. The JandaJel ligands were used inATRP of methyl methacrylate (MMA), styrene, and 2-(dimethylamino)ethyl methacrylate (DMAEMA).The MMA and DMAEMA polymerizations proceeded quickly to high conversion (>90%) and were well-controlled. The styrene polymerization was sluggish and proceeded only to 63% conversion. Recyclabilityof the catalyst was demonstrated by reusing the catalyst for a second ATRP reaction. A PMMA-b-PDMAEMA copolymer was also synthesized using JandaJel ligands. After polymerization was complete,the catalyst/ligand complex was easily removed by filtration. Elemental analysis indicated 0.05−0.07%residual copper in the unpurified polymers.
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