Page 213 - IJB-10-3

International Journal of Bioprinting Sr on GO enhances PLLA/PGA scaffold

crack branching, crack deflection, crack pinning, crack crack deflection, which could significantly increase the
bridging, and pulling out also occurred, eventually energy dissipation; however, more energy is required to
preventing the crack from expanding further. 64-67 The further propagate the crack after branching. At the same
specific enhancement mechanism was shown in Figure time, GPSr could prevent further crack propagation by
4j. Crack bridging and pulling out occurred when the pinning at the crack propagation tip. Ultimately, the above
crack passed through GPSr, which could slow down the mechanism effectively slowed down the fracture of the LG
rupture of the LG scaffold. When the crack propagated scaffold and improved mechanical properties.
in the LG/GPSr1.5 scaffold, the crack was deflected and SBF immersion experiment was conducted to
branched due to the blocking of GPSr in the LG scaffold. investigate the in vitro biological activity of the LG/GP
The zigzag path for crack propagation was created by and LG/GPSr1.5 scaffolds, which was compared with that

Figure 5. Surface morphology of the LG (a), LG/GP (b), and LG/GPSr1.5 scaffolds (c) immersed in SBF for 21 days, and their corresponding high-
magnification images (d, e); EDS element mapping of the LG (g), LG/GP (h), and LG/GPSr1.5 (i) scaffolds.

Volume 10 Issue 3 (2024) 205 doi: 10.36922/ijb.1829