fig3

Figure 3. (A) Binding energy of UPy-HBA with different components; (B) Low-field ¹H NMR results for PMDU₃ eutectogel under in situ stretching; (C) Variation of the peak area fraction for ν(C=O) in UPy-HBA under in situ stretching as a function of strain; (D) Temperature ramp curves for the PMDU₃ eutectogel from 25 to 100 °C at a heating/cooling rate of 5 °C·min^-1; (E) Stress relaxation curves for PMDN, PMDZ, and PMDU₃ eutectogels recorded at 25 °C with 10% strain; (F) Creep recovery curves for PMDZ and PMDU₃ eutectogels measured at 25 °C under a constant stress of 100 kPa; (G) Temperature-variable FTIR spectra of PMDU₃ eutectogel following thermal treatment from 20 to 100 °C (interval: 5 °C); (H) and (I) 2DCOS synchronous and asynchronous spectra respectively generated from (G). Note: in the 2DCOS spectra, red colors represent positive intensities and blue colors represent negative intensities. Data are shown as mean ± SD for n = 3 independent samples. UPy-HBA: 4-{6-[3-(6-Methyl-4-oxo-1,4-dihydropyrimidin-2yl)ureido]hexyl carbamoyloxy}butyl acrylate; NMR: nuclear magnetic resonance; PMDU: UPy-crosslinked poly (methacrylic acid-co-DMAPS) network; PMDN: covalently crosslinked poly (methacrylic acid-co-DMAPS) network; PMDZ: Zr⁴⁺-coordinated poly (methacrylic acid-co-DMAPS) network; 2DCOS: two-dimensional correlation infrared spectroscopy; SD: standard deviation; DMAPS: N-(3-sulfopropyl)-N-(methacryloxyethyl)-N,N-dimethylammonium betaine; ChCl: choline chloride; MAA: methacrylic acid; EG: ethylene glycol.