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