{HEAD ~ Plastics} which cure in a series of steps having urethane, {TAIL ~ urea}, siloxane and acrylate groups 
{ HEAD ~ Plastics } which cure in a series of steps having urethane , { TAIL ~ urea } , siloxane and acrylate groups
HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH REL OTH OTH TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH