Use of JandaJel resins for copper removal in atom transfer radical polymerization

Atom transfer radical polymerization (ATRP) ligands were supported onto JandaJel resins to allow for easy removal of the catalyst complex from the reaction mixture. Compared to divinylbenzene cross-linked resins, JandaJels have increased organic solvent compatibility and site accessibility due to the flexible cross-linker. These resins were chosen as the support in an attempt to obtain fast reaction times, good molecular weight control, and narrow polydispersity. The JandaJel ligands were used in ATRP 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. Recyclability of 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.