Synthesis and Properties of Poly(imides) and Poly(imides)/Ionic Liquid Composites Bearing a Benzimidazole Moiety

Abstract

Three new aromatic poly(imides) containing benzimidazole units in the backbone were synthesized and characterized by several spectroscopic techniques. Flexible spacer groups were incorporated into the poly(imides) structure to improve their solubility in organic solvents and their oxidative stabilization. All poly(imides) were thermally stable (Td5% > 512 °C) and had the ability to form dense flexible films. Novel composite films were successfully prepared by loading poly(imide) with ionic liquid ([Bmim]Br) at different concentrations up to 25 wt.%. The resulting materials were characterized according to their morphology and elemental composition (SEM-EDX), water uptake capability, contact angle, and oxidative degradation resistance. Results suggested that poly(imide)/ionic liquid composites would be excellent candidates for future proton conductivity measurements.

Carboxyl Function Group Introduced to Polyimide Binders for Silicon Anode Materials

“…The major difference between the spectra of PI and PI-COOH comes from the defined absorption band at 3400 cm –1 for the carboxyl group. The above characteristic peaks are clearly visible in the figure, proving the successful completion of the synthesis process of PI and PI-COOH . The crystal structure information of PI/Si and PI-COOH/Si can be obtained from the XRD diffraction patterns.…”

“…The above characteristic peaks are clearly visible in the figure, proving the successful completion of the synthesis process of PI and PI-COOH. 41 The crystal structure information of PI/Si and PI-COOH/Si can be obtained from the XRD diffraction patterns. From Figure 2b, it can be clearly seen that the diffraction peaks at 28.4, 47.3, and 56.2°, which are crystal diffraction characteristic peaks of nano-silicon particles (compared with the standard card PDF #27-1402), indicating that the addition of polyimide shows no obvious effect on the crystal structure of Si during the preparation of the electrode sheet.…”

Triboelectric Basalt Textiles Efficiently Operating within an Ultrawide Temperature Range

“…[ 8 ] To further broaden the temperature range, polyimide (PI) has attracted significant attention owing to its stabilizing thermal and mechanical characteristics, [ 9 ] as well as notable proton conductivity, particularly at high temperatures. [ 10 ] For instance, the V‐TENG could work in the car engine compartment of 30 to 70 °C. [ 11 ] The FD‐TENG could maintain 32% of its output performance at 200 °C in comparison with room temperature.…”