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