Figure 3.

PEGDA modulus can be controlled by multiple allyl-containing monomers and increasing monomer polarity and monomer concentration both decrease hydrogel stiffness. (a) allyl-presenting monomer chemical structures; (b) compressive moduli of hydrogels. Compressive modulus = slope of the stress–strain curve in the linear region following the toe region. Values reported as mean ± S.D. n = 4. * p < 0.05, ** p < 0.001, indicating a statistically significant difference. statistical analysis evaluated by one-way ANOVA followed by Tukey–Kramer HSD tests. n.d. indicates no data, α: gels broke before evaluated strain region, β: gels did not form.