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