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