图3-光学照片显示了复合样品的弯曲性和宏观外观(a)。Representative scanning electron microscopy (SEM) images at magnifications of 400x and 5000x of the cross-section of samples PUA0 (b), PUA20_100 (c), PUA40_50 (d), PUA40_100 (e), PUA40_200 (f), PUA60_100 (g), PUA65_100 (h).
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