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Although the pattern formation on polymer gels has been considered as aresult of the mechanical instability due to the volume phase transition, wefound a macroscopic surface pattern formation not caused by the mechanicalinstability. It develops on gelation surfaces, and we consider thereaction-diffusion dynamics mainly induces a surface instability duringpolymerization. Random and straight stripe patterns were observed, depending ongelation conditions. We found the scaling relation between the characteristicwavelength and the gelation time. This scaling is consistent with thereaction-diffusion dynamics and would be a first step to reveal the gelationpattern formation dynamics.Comment: 7 pages, 4 figure

Diffusion-induced spontaneous pattern formation on gelation surfaces