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