Thus, {HEAD ~ the addition} of {TAIL ~ diluting powdering agents} is not required, resulting in a purer polymer product 
of
Thus , { HEAD ~ the addition } of { TAIL ~ diluting powdering agents } is not required , resulting in a purer polymer product
OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH