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Synthetic route to the pH-responsive copolymers. Poly(ethylene glycol)-block-poly(γ-propargyl l-glutamate) (PEG-b-PPLG) copolymers were first synthesized (first row). Then, the PPLG block, indicated in red, was modified with azido-functionalized tertiary amines, diisopropylamine or diethylamine, by copper catalyzed azide–alkyne cycloaddition to form copolymers 1 to 4. Adapted with permission.[131] Copyright 2014, American Chemical Society.
