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Demonstration photographs of the sol-gel transition of copolymer 4 at 15 wt % solution in 0.1 M PBS of pH 7.4 during the incubation of 6 days at 37 oC: (a) at 4 oC, (b) at 37 oC, (c) after 1 day at 37 oC, (d) after 2 days at 37 oC, (e) after 4 days at 37 oC, (f) after 6 days at 37 oC.
