Homogeneous Poly(acrylamide) Hydrogels Made by Large Size, Flexible Dimethacrylate Cross-Linkers

Figure 1. (A) G′(filled symbols) and G′′(open symbols) of the reaction system in the presence of DMA-4 shown as a function of the reaction time. DMA-4 ) 0.3 (9), 2.0 (b), 3.3 ((), and 5 mol % (.). (B) The effective cross-link density νe of the hydrogels shown as a function of the cross-linker concentration. The solid curves are a guide to the eye. x ) 1( ∆ ), 2( 2 ), 4( b ), 9( O), and 14 (1).