The polymers have {HEAD ~ a controlled degree} of hydrophobicity with {TAIL ~ a corresponding controlled degree} of erosion in an aqueous or a biological environment of use 
The polymers have { HEAD ~ a controlled degree } of hydrophobicity with { TAIL ~ a corresponding controlled degree } of erosion in an aqueous or a biological environment of use
OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH