Fig. 1.

Preparation of PAH and MAPAH fibers. a Schematic illustration of the preparation of PAH and MAPAH fibers. A photograph of as-prepared PAH fiber shows the beads-on-a-string structure. b Photograph of a 1.1 m-long as-prepared PAH fiber. c SEM images of a PAH fiber. The scale bar is 100 μm. d SEM images of a MAPAH fiber. The scale bar in the left image is 200 μm, and the scale bar in the right image is 5 μm. A thin PMA layer on the PAAS core is clearly observed in the right image. e Photograph of a PAH web damaged by liquid water and a MAPAH web resistant to liquid water. Red circles indicate water droplets remaining on the hydrophilic PAH fiber, while no water droplet stays on the hydrophobic MAPAH fiber