Composition and properties of hydrogels.

M: Molar ratio of N,N′-methylenebis(acrylamide) to acrylamide; E: Elastic modulus, Q: Degree of swelling.M为N,N′-亚甲基双丙烯酰胺（N,N′-methylenebis(acrylamide)）与丙烯酰胺（acrylamide）的摩尔比；E为弹性模量（Elastic modulus）；Q为溶胀度（Degree of swelling）。