Universal Multifunctional Initiator Containing Orthogonal Reactive Sites. Synthesis of Macromonomers and Comb Polymers Using Consecutive Controlled Free Radical and Cationic Ring-Opening Polymerizations

摘要: A multifunctional reagent (1) containing orthogonal reactive sites that could serve as an initiator for multiple living polymerizations, namely, controlled free radical, anionic, and cationic a source variety of macromonomers, including those condensation polymerization functional polymers, has been designed synthesized in three steps good yields. The contained alkoxyamine derived from 2,2,6,6-tetramethylpiperidin-1-yloxyl (TEMPO), oxazoline, protected hydroxyl group. Thus, initiation radical styrene at the terminal gave polystyrene (PS) macromonomer with low polydispersity (Mw/Mn = 1.06−1.16). Cationic ring-opening oxazoline group amphiphilic comb polymer hydrophilic poly(ethyleneimine) backbone hydrophobic PS side chain. polymers were characterized by GPC, 1H 13C NMR, MALDI−TOF mass spectroscopy. versatility structure is such t...