Its chain extension was first carried out at 20 wt % solids with LMA (targeted DP n,PLMA = 150) and BMDO (f BMDO,0 = 0.66) in DMF at 90°C for 24 h, in presence of T21s as the initiator (C0, Table ). to: MWPtx / Mn,copolymer, with MWPtx = molecular weight of Ptx and Mn,copolymer = Mn of the polymer prodrug considered. e Determined by SEC after purification by dialysis. f Mn and Mw decrease after degradation of copolymers under accelerated conditions, calculated according to: (exp. Mn,SEC -initial Mn,SEC) / initial Mn,SEC.