Thereafter, {TAIL ~ the reactor} is charged with the polymerization medium and ingredients in {HEAD ~ the usual manner} and the polymerization reaction commenced 
Thereafter , { TAIL ~ the reactor } is charged with the polymerization medium and ingredients in { HEAD ~ the usual manner } and the polymerization reaction commenced
OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH