The alkyl alcohol is removed and {HEAD ~ the excess ethanolamine} is reacted with {TAIL ~ ethylene} or propylene carbonate to form the urethane diol 
is reacted with
The alkyl alcohol is removed and { HEAD ~ the excess ethanolamine } is reacted with { TAIL ~ ethylene } or propylene carbonate to form the urethane diol
OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH