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