Fig. 2. Mechanical properties of PDMS–SS–IP–BNB elastomer.

a Photographs of a PDMS–SS–IP–BNB elastomer film (P4) before and upon stretching. b Stress–strain curves of PDMS–SS–IP–BNB elastomer films prepared with different molar ratios. c Stress–strain curve of the PDMS–SS–IP–BNB elastomer film (P3) at different speeds. Sample width, 14 mm; thickness, 1 mm; gage length, 2 mm. d Stress–strain curves of the film (P3) in stress–strain tests (20%, 50%, 80%, 100% strain) in successive stretching. e The stress–strain curve of the film (P3) in cyclic stress–strain tests (30% strain) in successive stretching. Sample width, 14 mm; thickness, 1 mm; gage length, 40 mm. Stretching speed, 10 mm min⁻¹. f, g A notch-insensitive and highly stretchable elastomer film (P3). A notch (8 × 8 mm²) with 2 mm thickness, 20 mm length, and 16 mm width (left) was made in the P3 film, and the film was stretched at a loading rate of 10 mm min⁻¹. The inset graph is the schematic diagram of notch location. Source data are provided as a Source Data file.