Investigation and fine-tuning of POD membranes by copolymerizing with diglycolic acid

Fabrication and characterization of modified POD membranes with ultra-high tensile strength through hydrogen bonding functioning and copolymerization

“…The temperature was gradually raised from 300°C to 800°C in a nitrogen atmosphere at a rate of 5°C/min, following the protocol described in the literature. 34,43 At 430°C, the membrane enters the second stage of weight loss (∼10%), where some unfused TPH may be present. The second stage of weight loss begins at 430°C–500°C, caused by the decomposition of the oxadiazole ring.…”

“…In this study, phase conversion method 33 was utilized to prepare POD and T-POD X membranes. The substrates were meticulously coated with polyhydrazine prepolymer on a glass plate at a temperature of approximately 120°C using a 150 μm wire-rod coater (purchased from Asahi), which is suitable for high viscosity fluid handling.…”

“…In our previous work, we have attempted to modify POD using diglycolic acid 33 and nitrilotriacetic acid, 34 resulting in a one-dimensional, more flexible linear structure and three or multi-dimensional network structure, respectively. These modifications increased intermolecular interactions by constructing chemical bonds in the polymer, thereby significantly improving mechanical properties and membrane formation processes of the materials.…”

“…This approach enhanced both of quality and relative integrity of the membranes, as evidenced by their elongation and growth behavior. 33 To further enhance the performance of PODs, we attempted to use H 3 BTC as chain extender in condensation reaction, while pentaerythritol as cross-linker, so as to explore the roles of cross-linkers and chain extenders in constructing POD macromolecules and preparing polymeric membrane materials. Cross-linkers have been shown to enhance thermal stability, solvent as well as chemical resistance of polymers, 13,35,36 while chain extenders react with functional groups along linear polymer chains 27,37 to extend the molecular chain and increase the molecular weight, improving the mechanical and process performance of polyamides, polyurethanes and polyesters.…”