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Small-angle X-ray scattering (SAXS) 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 refer to fibers of pure polypropylene, while red, blue, and green curves refer to fibers of iPP with rGO-CP in the amount of 0.1, 0.5, and 1.0 wt.%, respectively.
