Synthesis of polyoxazolines using glycerol carbonate derivative and end chains functionalization via carbonate and isocyanate routes

We report the cationic ring‐opening polymerization of 2‐methyl‐2‐oxazoline (MOx) using bio‐based initiator (GCTs). The functional initiator GCTs was prepared by tosylation of the corresponding alcohol: glycerol carbonate (GC). The termination stage of the polymerization was achieved in presence of KOH and the telechelic polyoxazoline carrying five‐membered cyclic carbonate and oxazolium end groups (GC‐POx ium ) was converted to ((HO) 2 ‐POx‐OH) carrying α‐diol and ω‐hydroxyl groups. End‐functionalized polyoxazolines (HO) 2 ‐POx‐OH with M n ranging from 4200 to 8400 g mol −1 were synthesized. According to GPC results, the polymerizations of MOx using GCTs and other initiator coming from 1,2‐isopropylidene‐glycerol (Solk‐Ts) were compared. On the basis of FTIR and NMR spectroscopies, the chemical modification of end chains of polyoxazolines was investigated by two alternative synthetic routes. The isocyanate route is a postpolymerization urethanization. The nucleophilic reactivity of the α‐diol and ω‐hydroxyl groups of (HO) 2 ‐POx‐OH was studied with functional isocyanate (TESPI). In the carbonate route, the electrophilic reactivity of α‐ and ω‐end groups of GC‐POx ium were explored with amine. It was demonstrated that during the termination stage of the polymerization in presence of allylamine both urethane linker in α‐end chain was synthesized and the ω‐oxazolium group was converted into terminal amine. The carbonate route is an alternative to synthesize urethane without isocyanate.