adding {HEAD ~ a catalyst} into the water to polymerize {TAIL ~ the monomer} in the micell 
adding { HEAD ~ a catalyst } into the water to polymerize { TAIL ~ the monomer } in the micell
OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH