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Scheme of the synthesis of hydrazide-functionalized precursor copolymers (PNIPAAm-co-ADH) (Route A) and aldehyde-functionalized precursor copolymers (PNIPAAm-co-oxoethyl methacrylate) (Route B). ADH is the acronym of adipic acid dihydrazide compound used as reversible and rapid functionalization of PNIPAAm oligomers. Adapted with permission from Reference [76]. Copyright © 2012 American Chemical Society.
