In the case of matrices composed of polyurethanes, preferred coatings include {HEAD ~ hydroxyl} containing {TAIL ~ polyethylene copolymers} such as ethylene vinyl alcohol copolymers 
In the case of matrices composed of polyurethanes , preferred coatings include { HEAD ~ hydroxyl } containing { TAIL ~ polyethylene copolymers } such as ethylene vinyl alcohol copolymers
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH