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Materials 2019, 12, 1281 6 of 14 Materials 2019, 12, x FOR PEER REVIEW 6 of 14 Figure 2. Viscosity-shear rate curves (a), and stress-shear rate curves (b) for various coal tar pitch/ polyacrylonitrile (CTP/PAN) solutions. Sample code U0 Viscosity (Pa.s) 0.768 Flow behaviour index (n) 0.99 Diameter (μm) Electrical conductivity (mS/cm) 127.8 Table 1. Rheological and structural properties of PAN/CTP solutions. Figure 2. Viscosity-shear rate curves (a), and stress-shear rate curves (b) for various coal tar pitch/ Figure 2. Viscosity-shear rate curves (a), and stress-shear rate curves (b) for various coal tar pitch/ U2 0.848 0.95 0.45 ± 0.07 116.4 104.9 polyacrylonitrile (CTP/PAN) solutions. polyacrylonitrile (CTP/PAN) solutions. 0.92 U4 0.38 ± 0.13 Sample code U0 U2 U4 Viscosity (Pa.s) 0.768 0.848 1.63 U0 Flow behaviour index (n) 0.99 0.95 0.92 Diameter (μm) 0.38 ± 0.13 0.45 ± 0.07 0.72 ± 0.13 Electrical conductivity (mS/cm) 127.8 116.4 104.9 Table 1. Rheological and structural properties of PAN/CTP solutions. U0 U2 U4 U2 Figure 3. Left column: optical images of fibre samples, middle column: scanning electron microscopy (SEM) images of samples at low magnification and right column: SEM images of samples at high magnification for 0% (U0), 25% (U2) and 50% (U4) CTP in rows 1, 2 and 3, respectively. As the amount of CTP in PAN increases, the colour of the fibre mats turn to gold-brown and the stack of fibres became thicker.PDF Image | Low-Cost Carbon Fibre Derived from Sustainable Coal Tar Pitch and Polyacrylonitrile
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