Journal of Polymer Science Part A: Polymer Chemistry
Ufuk Saim Gunay, Hakan Durmaz, Eda Gungor, Aydan Dag, Gurkan Hizal, Umit Tunca
Well-defined linear furan-protected maleimide-terminated poly(ethylene glycol) (PEG-MI), tetramethylpiperidine-1-oxyl-terminated poly(-caprolactone) (PCL-TEMPO), and azide-terminated polystyrene (PS-N3) or -poly(N-butyl oxanorbornene imide) (PONB-N3) were ligated to an orthogonally functionalized core (1) in a two-step reaction mode through triple click reactions. In a first step, DielsAlder click reaction of PEG-MI with 1 was performed in toluene at 110 °C for 24 h to afford -alkyne--bromide-terminated PEG (PEG-alkyne/Br). As a second step, this precursor was subsequently ligated with the PCL-TEMPO and PS-N3 or PONB-N3 in N,N-dimethylformamide at room temperature for 12 h catalyzed by Cu(0)/Cu(I) through copper-catalyzed azide-alkyne cycloaddition and nitroxide radical coupling click reactions, yield resulting ABC miktoarm star polymers in a one-pot mode.