Atom transfer radical polymerization of methyl methacrylate mediated by copper bromide - Tetraethyldiethylenetriamine grafted on soluble and recoverable poly(ethylene-b-ethylene glycol) supports

Polyethylene (PE) and polyethylene-block-poly(ethylene glycol) (PE-PEG) gra fted with N,N,N',N'-tetraethyldiethylenetriamine (TEDETA) were used as solu ble and recoverable supports for copper bromide mediated atom transfer radi cal polymerization (ATRP) of methyl methacrylate (MMA). The PE chain length and poly(ethylene glycol) (PEG) spacer strongly affected the catalytic act ivity and control of the polymerization. With PE as a catalyst support, the catalytic activity and control of the polymerization were low and decrease d as the PE support's chain length increased. The adverse effects of the PE support were minimized by using PEG as spacer to graft the catalyst onto t he PE support. The PE25-PEG(4)-TEDETA-CuBr and PE16-PEG(10)-TEDETA-CuBr wer e found effectively mediated ATRP of MMA. The recycled PE-supported catalys ts had low activity because of catalyst side reactions and/or catalyst loss , but the PE25-PEG(4)-TEDETA-CuBr retained 90% activity upon recycling and had good control over the polymerization.