| Autor: |
Venkatachalam, Kaarthick Raaja, Gautham, Sachin M. B., Nambi Krishnan, Jegatha Nambi |
| Předmět: |
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| Zdroj: |
Polymer Bulletin; Jul2023, Vol. 80 Issue 7, p7805-7824, 20p |
| Abstrakt: |
In-house synthesized monosulfonated para-polybenzimidazole (s-p-PBI) was blended with commercially available disulfonated poly(arylene ether) sulfone (SPAES; SES0105, Aquafone™). The s-p-PBI was prepared from the polycondensation of 2-sulfoterepthalic acid and 3, 3ʹ-diaminobenzidine. The 1H NMR spectroscopy confirms the formation of benzimidazole protons. Copolymer SPAES behaves as the electron-withdrawing polymer (sulfonic groups), and s-p-PBI as the electron-donating polymer (imidazole groups). The interactions between polymers are examined through Attenuated Total Reflectance-Fourier Transformed Infrared spectroscopy (ATR-FTIR), Thermogravimetric Analysis (TGA), and Scanning Electron Microscopy (SEM). Tensile stress at maximum load of blend membrane containing 80% (w/w) of s-p-PBI and 20% (w/w) of SPAES (AM-AC-80) is 55.59 MPa, whereas pristine s-p-PBI (AM-AC-100) membrane is 45.35 MPa. The blend polymers were stable in boiling water. All the blend membranes were morphologically stable at 1500 ppm of NaOCl solution immersed for 24 h except for pristine s-p-PBI. The blend polymers showed improved tensile strength and stability in NaOCl solutions compared to pristine s-p-PBI. The blend membranes displayed improved salt rejection with decreasing water permeability. The intrinsic parameters for desalination performance were examined to correlate crosslinking with water and salt transport. AM-AC-80 shows a slight improvement in water diffusivity and a four-fold increase in permeability selectivity (water/NaCl) compared to pristine s-p-PBI. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
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