A New Route to Model (A2B) and Regular Graft Copolymers

We describe a new and easy route to model graft copolymers A 2 B as the simplest model and regular graft copolymer in which the grafting points are regularly spaced and the grafts have strictly the same size. This route is based on a double addition−elimination reaction of polystyryl Li or K on a specific 1,1-diphenylethylene derivative. The resulting well-defined A 2 B structures include (PS) 2 PtBuMA, (PS) 2 PMMA, (PS) 2 PEO, (PS) 2 PεCL, (PS) 2 PLLA, and regular graft copolymers with PS backbone and PEO or PtBuMA grafts.