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Wide-angle X-ray scattering (WAXS) patterns of polypropylene fibers: (a) gravity spun; fibers taken at (b) 50 m/min; (c) 200 m/min; (d) 800 m/min. In the drawings, black curves (1) refer to fibers of pure polypropylene, while red (2), blue (3), and green (4) curves refer to fibers of iPP with rGO-CP in the amount of 0.1, 0.5, and 1.0 wt.%, respectively. (The curves were shifted along the intensity axis for clarity).
