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