The carbodiimide can promote the formation of crosslinks between {HEAD ~ carboxylate and amine groups} of {TAIL ~ the polyelectrolytes} 
of
The carbodiimide can promote the formation of crosslinks between { HEAD ~ carboxylate and amine groups } of { TAIL ~ the polyelectrolytes }
OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL