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. 2019 Sep 23;14(9):e0222662. doi: 10.1371/journal.pone.0222662

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© 2019 Chen et al

This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

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Fig 3 — Impact strength (IS) of TPNR/GNP composites (a) treated with different ultrasonic (US) hours, (b) at various filler weight fractions, (c) ANOVA analysis for both factors in impact properties, and (d) IS enhancement compared with pure TPNR. Note: ^aF value = mean between groups variance/ mean within group variance; ^bProbability from 0 to 1; ^ccritical F value based on F distribution. Groups with a significant difference (p < 0.05) compared to TPNR/GNP composite assisted with 3 hours US is indicated by # symbol.