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posted on 14.05.2019, 03:30 by Yueqi Mo, Kai Cheng, Jiepin Hu, Yancheng Wu, Zhigeng Cheng, Chuqi Shi, Yanchao Yuan, Shumei Liu, Jianqing Zhao
1H NMR test was carried out on a Bruker Avance 400 spectrometer at resonant frequencies of 400 or 600 MHz, using DMSO-d6 and CDCl3 as solvent. Fourier-transform infrared spectra (FT-IR) and attenuated total reflection Fourier-transform infrared spectra (ATR FT-IR) were recorded with a Bruker Vector 22 spectrometer between 400 and 4000 cm−1. High resolution liquid chromatography-mass spectrometry (HRLC-MS) data were recorded on an Agilent 1290-micrOTOF-QII instrument. Thermal stability was assessed using thermogravimetric analyzer (TGA) operated at a 20 °C min−1 from 30 to 800 °C under N2 gas flow. Differential scanning calorimetry (DSC) analysis was conducted on a Netzsch DSC 200F3 at a heating rate of 5 °C min−1 under nitrogen atmosphere from 30 to 400 °C. Dynamic mechanical thermal analysis (DMA) was conducted on a TA Instruments DMA Q800 at a heating rate of 5 °C min−1 from 30 to 500 °C and a load frequency of 1 Hz under nitrogen, and the specimen was made with 6 mm width, 25 mm length, 50 μm thickness. Ultraviolet–visible (UV-Vis) spectra were recorded on a 3600 UV-Vis spectrophotometer at room temperature. Dielectric constants were investigated by a Hewlett-Packard 4284A dielectric spectrometer in the frequency range of 40 Hz to 1 MHz at room temperature. Wide-angle X-ray diffraction (WXRD) patterns was taken from 10° to 40° (2θ values) with Cu Kα radiation.