Fig. 1: Fabrication and optimization of S-AUX film.
From: A seamless auxetic substrate with a negative Poisson’s ratio of −1
a Schematic illustrations of stretchable displays in an original state (left), and stretched states with various substrate materials: S-AUX film (center left), conventional elastomer (center right), and conventional auxetic film (right). b Exploded view of S-AUX film composed of auxetic-shaped GFRPDMS and soft elastomer. c Operating mechanism and configurations of the S-AUX film: before stretching and stretched configuration. d Photographic images of the S-AUX film. A rigid auxetic domain composed of GFRPDMS has an opaque white color, while the elastomer filling the stretchable domain is transparent; Inset image shows a zoomed-in view. Scale bar, 1 mm; SEM image of the film cross-section (Scale bar, 200 μm), and magnified view (Scale bar, 20 μm). e Tensile stress-strain curves of the GFRPDMS films (PDMS 10:1 reinforced by various types of glass-fabric) and elastomers (PDMS and Ecoflex). Lower modulus and higher stretchability were obtained by reducing the crosslinker contents (i.e., part B) of the PDMS46.
