The devices comprise {TAIL ~ a body} formed of a polymeric backbone having {HEAD ~ a repeating unit} of a hydrocarbon radical and symmetrical dioxycarbon unit with a multiplicity of organic groups bonded thereto 
The devices comprise { TAIL ~ a body } formed of a polymeric backbone having { HEAD ~ a repeating unit } of a hydrocarbon radical and symmetrical dioxycarbon unit with a multiplicity of organic groups bonded thereto
OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH