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