Fig. S1.

A thin uniform layer of PEMA/POSS is coated on the exposed surface of a creased polyurethane elastomer via viscous withdrawal from PEMA/POSS/Asahiklin solution. (A) A schematic illustration of the dynamic meniscus in the viscous withdrawal coating process with a vertical withdrawal speed of $U\approx 0.1\hspace{0.5em}\mathrm{m}/\mathrm{s}\mathrm{\cdot }h$ and $l_c$ indicate the thickness of the coated solution layer and the capillary length, respectively. (B) A cross-sectional SEM image of the PEMA/POSS-coated polyurethane elastomer. The thickness of the dry PEMA/POSS layer is about 1 μm, in good agreement with the predicted result by scaling analysis of the viscous withdrawal process. The thickness of the PEMA/POSS layer is measured at five different spots across a surface with lateral dimensions of 5 × 5 cm and the results are within 10% variation, indicating a uniform coating layer is achieved through the viscous withdrawal coating process.