Crosslinking structures of POD membranes copolymerized with nitrilotriacetic acid and their properties

Xie, Wenlian; Li, Lihong; Wang, Xiaogang; Yuan, L.; Zhu, Zhiqiang

doi:10.1016/j.polymer.2021.124484

Cited by 1 publication

(3 citation statements)

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“…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.…”

Section: Resultsmentioning

confidence: 99%

“…Synthesis of terephthalic dihydrazide (TPH) was carried out by using a modified preparation method in literature. 34 Terephthalic acid (8.0 g, 50.0 mmol) was added to a 200 mL round bottom flask, followed by 80 mL of anhydrous methanol and 0.5 mL of concentrated sulfuric acid (as a catalyst). The reaction was refluxed for 12 h, and then cooled to room temperature.…”

Section: Preparation Of Dihydrazide From Dicarboxylic Acidmentioning

confidence: 99%

“…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.…”

Section: Introductionmentioning

confidence: 99%

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

Huang,

Li,

Xie

et al. 2023

High Performance Polymers

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A series of modified aromatic oxadiazole polymers were synthesized via condensation reactions of terephthalic dihydrazide (TPH) and varying amounts of Trimesic acid (H3BTC) in polyphosphoric acid (PPA). Pentaerythritol was introduced to construct intermolecular hydrogen bonds among polymeric chains, resulting in a three-dimensional network structure, and correlations between H-bonds and mechanic properties are discussed. Structures and mechanic properties of the polymers were characterized and analyzed. By investigation of molecular structure and membrane formation process of chemically modified and hydrogen bond-regulated polymer membranes, it was found that the modified polymer membranes retain the unique thermal stability, chemical stability, and good hydrophobicity of the POD rigid polymer. Additionally, hydrogen bonds not only significantly improve the overall quality of the membrane, but also play an important role in enhancing the mechanical properties of the membrane, as demonstrated in the highest observed of up to a maximum of 167.19 MPa. Furthermore, impact of H3BCT modification on light absorption and fluorescence performance of T-PODx is also analyzed and discussed in this paper.

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Section: Resultsmentioning

confidence: 99%

Section: Preparation Of Dihydrazide From Dicarboxylic Acidmentioning

confidence: 99%