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Fracture toughness analysis. Plot of (A) J vs. crack extension for PCL-BG and U-BG/PUR composites. SEM images of pre-cut micro-notch (left half of image) and interior of cracked specimen (right half of image) for (B) PCL-BG/PUR, (C) CaS/P, and (D) U-BG/PUR, after fracture toughness testing. Scale bar indicates 667 µm.
