The methylene chloride forms {HEAD ~ a complex} with {TAIL ~ the unreacted polyphenylene ether} and with the polyphenylene ether portion of the copolymer 
with
The methylene chloride forms { HEAD ~ a complex } with { TAIL ~ the unreacted polyphenylene ether } and with the polyphenylene ether portion of the copolymer
OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH