The R and R groups in the dicarboxylic acid may be {TAIL ~ an alkylene} or an arylene moiety having from 3 to 34 carbon atoms in one embodiment, in one aspect from {HEAD ~ 4 to 20 carbon atoms}, and in a further aspect from 4 to 9 
The R and R groups in the dicarboxylic acid may be { TAIL ~ an alkylene } or an arylene moiety having from 3 to 34 carbon atoms in one embodiment , in one aspect from { HEAD ~ 4 to 20 carbon atoms } , and in a further aspect from 4 to 9
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH 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 OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH