Fig. 4.

Mechanical, swelling, and degradation properties of bilayer hydrogel scaffolds. A) Compressive stress-strain curves. B) G′ and G″ were determined through rheological testing under a constant oscillation amplitude (γ) of 1 % and frequency ranging from 0.1 to 10 Hz. C) Compressive strength (n = 3) at 20 % strain of bilayer hydrogel scaffolds. D) Swelling ratios and E) degradation rates of bilayer hydrogel scaffolds. The data were analyzed by one-way analysis of variance, and error bars indicate mean ± standard deviation, *p < 0.05, **p < 0.01, and ***p < 0.001.