Soluble and cross-linkable polyimides from a vanillin-derived diamine: preparation, post-polymerization and properties

Abstract

A novel trifluorovinyl-ether (-OCF=CF2, TFVE) functionalized diamine (DA-TFVE) with triarylmethane structure was successfully obtained from renewable vanillin through a Brönsted acidic ionic liquid catalyzed Friedel-Crafts reaction. Subsequently, traditional two-step condensations...

Green synthesis of polyimide by using an ethanol solvothermal method for aqueous zinc batteries

“…Furthermore, absorption peak at 1777 cm −1 , attributed to the CO in urea, was observed. 39–46 Meanwhile, N–H absorption peaks of urea were observed in the range of 3200–3600 cm −1 . 43 Notably, when the ethanol content was 10%, 30%, 50%, and 70%, no clear absorption peak of urea CO was detected in the FTIR spectra of the synthesized U-PI.…”

“…39–46 Meanwhile, N–H absorption peaks of urea were observed in the range of 3200–3600 cm −1 . 43 Notably, when the ethanol content was 10%, 30%, 50%, and 70%, no clear absorption peak of urea CO was detected in the FTIR spectra of the synthesized U-PI. However, when the ethanol content increased to 100%, the CO absorption peak of urea emerged, indicating that U-PI synthesized under higher ethanol content conditions exhibited a higher degree of amide formation compared to U-PI-0, U-PI-30, U-PI-50, and U-PI-70 electrode materials.…”