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