To control for the effect of variable epoxide concentration, samples were next formulated at a constant epoxide molar concentration (Figure ). Epoxide concentration was set to 1 M, resulting in variable weight percent polymer in solution: control polymer samples with low (25%) and shielded samples with high (61%) weight percent. At 25 wt%, poly(GMA-co-MEMA) crosslinks more slowly (2 h) than at 50 wt% and reaches a lower final G' on the order of 10 5 Pa. For poly(GMA-co-PEGMA950), wt% changes from 50 to 61 and expectedly shows only a small increase in G' of 35 Pa. For poly(GMA-co-PEGMA500 samples, 1 M epoxide concentration is equal to 50 wt% of polymer. Trends in the effect of shield groups are the same at constant wt% or mol% epoxides: as the shielding group MW increases, the time to gelation and the final modulus both decrease.