| Poly[(1,3-dihydro-1,3-dioxo-2H-isoindole-2,5-diyl)oxy-1,4-phenylene-9H-fluoren-9-ylidene-1,4-phenyleneoxy(1,3-dihydro-1,3-dioxo-2H-isoindole-5,2-diyl)[3-(trifluoromethyl)-1,4-phenylene]oxy[1,1'-biphenyl]-2,5-diyl-9H-fluoren-9-ylidene[1,1'-biphenyl]-5,2-di |
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