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Scanning electron microscope images of cryofractured surfaces of PP composite strands filled with (a) 2.5 vol% CNT and 5 vol% GNP, (b) 5 vol% CNT and 2.5 vol% CF, (c,d) 2.5 vol% CF, 2.5 vol% CNT, and 2.5 vol% GNP (CNT: orange arrow, GNP: light blue arrow, CF: white arrow).
