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Polyacrylonitrile (PAN) in dimethylformamide solution containing 0.25 or 1 wt% graphene oxide (GO) was gel spun to tapes. Scanning electron microscopy of tapes showed compact staircase cross-sections hallmarking the gel spun products. Low shear rate rheometry of the tape precursors revealed a viscosity increase, while the structural viscosity indexes of dispersions dropped to 40 and 70% at high shear...
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