The initiating constituent is usually present in an amount of {HEAD ~ about 0.05 to about 5 percent} by {TAIL ~ weight} of the copolymer 
The initiating constituent is usually present in an amount of { HEAD ~ about 0.05 to about 5 percent } by { TAIL ~ weight } of the copolymer
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH