Extended Data Fig. 4: Programmed recovery delay for poly(N-isopropyl acrylamide) hydrogel.
a, Precursors of the poly(N-isopropyl acrylamide) hydrogel and the comparison of its shape recovery kinetics of with and without programming (the photo-images shows a recovery onset of around 2 min). b, Recovery kinetics for poly(N-isopropyl acrylamide) hydrogels prepared with different crosslinker concentrations. The water contents during recovery are 81.9%, 71.7%, 64.6% and 48.4% corresponding to the samples with crosslinker contents of 2.5%, 5%, 7.5% and 10%, respectively. The programming condition is 30 min in the decane. c, Impact of crosslinker concentration on the onset period at a fixed programming time of 30 min. Error bars correspond to s.d. (n = 4). d, Effect of programming time on the recovery kinetics for poly(N-isopropyl acrylamide) hydrogel at a fixed crosslinker concentration of 5.0%. The water contents during recovery are 76.2%, 69.5%, 68.9%, and 64.5% when programming for 10 min, 30 min, 60 min, and 120 min, respectively. e, Impact of programming time on the onset period, corresponding to d. Error bars correspond to s.d. (n = 4). f, Recovery process with an onset period of 10 min after programming for 30 min.
