An example of {HEAD ~ two additional and especially preferred gamma butyrolactone} derived {TAIL ~ monomer types} according to the present invention are shown below: ##STR5## 
derived
An example of { HEAD ~ two additional and especially preferred gamma butyrolactone } derived { TAIL ~ monomer types } according to the present invention are shown below : # # STR5 # #
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 OTH OTH OTH OTH OTH OTH OTH OTH OTH