Uniaxial tension tests were conducted on a universal material testing machine (Model Insight 10, MTS Inc., Eden Prairie, MN) with a load capacity of 10 kN and a cross-head speed of 1 mm/min at 25°C. At least three tests were conducted for each sample to get average results. The thermomechanical properties were measured on a dynamic mechanical analysis tester (Q800, TA Instruments, New Castle, DE) with a frequency of 1 Hz. The gel fraction was measured by soaking the samples in refluxing acetone at 70°C for 12 hours, followed by drying at 80°C for 6 hours. FTIR spectra (Nicolet iS50 spectrometer, Thermo Fisher Scientific, Waltham, MA) were recorded by averaging 32 scans of the signal at a resolution of 2 cm−1 in attenuated total reflectance mode. Proton nuclear magnetic resonance (1H NMR) spectra were recorded on a Bruker Avance III 400 (Billerica, MA) at ambient temperature in CDCl3.

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