Design a sequence of reactions for grafting a carboxyl derivative to a chitosan gel network and for grafting an amine derivative to alginate What structural details impart to a gel the ability to...

Design a sequence of reactions for grafting a carboxyl derivative to a chitosan gel network and for grafting an amine derivative to alginate

What structural details impart to a gel the ability to respond to a chemical stimulus? How does the gel react to such a stimulus?