Fig. 4: The delayed crystallization process of HPWPUE illustrated through SAXS and WAXS analyses and mechanical performance comparison with commercial TPUE and other WPUE.
From: Delayed crystallization response-inspired waterborne polyurethane with high performance
a 2D-SAXS patterns of HPWPUE acquired for q ≤ 2 nm-1 during stretching. b Azimuthal profiles averaged for q = 0.10–1.11 nm-1 from the patterns in panel (a) shown for varying stretch ratios (λ) indicated. c 1D SAXS profiles in the equatorial (φ = 90°) or stretching direction. d 1D SAXS profiles in the meridional (φ = 0°) (e) A subset of the 2D–WAXS patterns of HPWPUE acquired during stretching. Due to instrument occlusion, most part of the patterns in the equatorial direction is not visible. The dashed arrows in panels a and e indicate the azimuthal direction. f 1D–WAXS profiles in the meridional direction and (g) φ = 70° direction. h Scatter plot of tensile strength (σe,max) versus elongation at break (εe,max) for various stretchable TPUEs. The meanings of the symbols and details about these elastomers can be found in Supplementary Table 4. i Scatter plot of toughness versus tensile strength (σe,max) for other WPUE. Details and references for these elastomers are provided in Supplementary Table 5.
