▎ 摘　　要

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 rates by 0.25 and 1 wt% GO inclusion, respectively. Furthermore, the sol-gel transition temperature of PAN solution was enhanced by about 2.5 and 10 degrees C with 0.25 and 1 wt% GO inclusion, respectively. Strain sweep test implied a gel-to-sol transition from 9 to 28% by 1 wt% GO inclusion. The experimental reinforcement coefficient corresponded the aligned Halpin-Tsai model confirming the suitable dispersion preparation route namely master batch dilution implementing strong interphase formation among the PAN chains and GO platelets. Molecular evolution analysis during air stabilization through a combined second derivative of FTIR spectra, Gaussian peak fitting represented by I-sd index, indicated the initial cyclization at 290 degrees C followed by its enhanced rate. Final I-sd was noticed to be 48% higher for the tapes containing GO nanosheets. GO inclusion not only enhanced the tape heat of stabilizations but also differentiated its proportional I-sd and toughness dependency based on the heat of stabilization.