{HEAD ~ The presence} of units derived from polyethylene glycol within the polymer chain has been found to lead to {TAIL ~ such intrinsic viscosity reduction} within the dye bath 
found to lead to
{ HEAD ~ The presence } of units derived from polyethylene glycol within the polymer chain has been found to lead to { TAIL ~ such intrinsic viscosity reduction } within the dye bath
HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH REL REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH