Extended Data Fig. 4 |. Bright-field optical microscopy images of drop morphologies obtained from mixtures of macromers (〈ℓ〉 ≈ 9) and monomers (RM82) at different weight ratios in a 0.1 wt% SDS aqueous solution after cooling.

With a fixed amount of RM82, increasing the concentration of macromers in the drop leads to longer 〈ℓ〉, larger bulk elasticity, and lower interfacial tension. The latter two factors favor interfacial roughening and filament formation. Images are taken at the room temperature after cooling. Scale bar: 50 μm.