Reagents used in preparing a graft polymer are selected from {HEAD ~ the group} consisting of carbon dioxide, silicon halides, and {TAIL ~ anionically polymerizable monomers} 
Reagents used in preparing a graft polymer are selected from { HEAD ~ the group } consisting of carbon dioxide , silicon halides , and { TAIL ~ anionically polymerizable monomers }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL REL OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL