{HEAD ~ Fiber} of wholly aromatic copolyamide from {TAIL ~ 2,6 naphthalene dicarboxylic acid} and 3,4 diaminodiphenylether 
{ HEAD ~ Fiber } of wholly aromatic copolyamide from { TAIL ~ 2,6 naphthalene dicarboxylic acid } and 3,4 diaminodiphenylether
HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH