Fig. 4: Toughening mechanism for DiMPUs. | Nature Communications

Fig. 4: Toughening mechanism for DiMPUs.

From: Entropy-driven toughening and closed-loop recycling of polymers via divergent metal-pyrazole interactions

Fig. 4

a Engineering stress-strain curves of uniform coordination systems (PyPU and BPyPU) and DiMPU elastomers. b Typical force-extension curves during single-molecule force spectroscopy characterization of DiMPU-Cu1 and PPU. c Histogram of the rupture force of DiMPu-Cu1. d C = O vibration deconvolution of DiMPU-Cu1 showing six resolved peaks corresponding to: Ⅰ (free urethane), Ⅱ (disordered H-bonded urethane), Ⅲ (ordered H-bonded urethane), Ⅳ (free urea), Ⅴ (disordered H-bonded urea), Ⅵ (ordered H-bonded urea). e The synchronous and f asynchronous 2DIR spectra calculated for the 1750–1400 cm-1 band of DiMPU-Cu1. Red and blue areas indicate positive and negative values, respectively, and signal intensity increases with color intensity. g 2D-SAXS patterns of DiMPU-Cu1 subjected to different stretching strains. h 1D-SAXS experimental data of DiMPU-Cu1 with Zernike-Prins model fitting (red line). Inset: the schematic diagram of multiphase structures for DiMPU-Cu1 according to fitting results. i AFM image of the DiMPU-Cu1 elastomer. Inset: size distributions of hard segment clusters. j 1D-SAXS profiles of DiMPU-Cu1 under different stretching strains.

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