The comonomer may be a nonpolar, ionic, polar comonomer or {HEAD ~ mixtures} of {TAIL ~ such monomers} 
of
The comonomer may be a nonpolar , ionic , polar comonomer or { HEAD ~ mixtures } of { TAIL ~ such monomers }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL