Abstract
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.
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06 September 2022
A Correction to this paper has been published: https://doi.org/10.1007/s00289-022-04452-3
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Acknowledgements
We would gratefully acknowledge Dr. Santanu Karan, Senior Scientist from the Council of Scientific and Industrial Research-Central Salt and Marine Chemicals Research Institute (CSIR-CSMCRI) Bhavnagar (India), for conducting desalination measurements for our synthesized and casted membranes in his laboratory.
Funding
This work was funded by the Department of Science of Technology-Science and Engineering Research Board (DST-SERB), Government of India [Grant number ECR/2015/000014].
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Material preparation, data collection, characterization, and analysis were performed by KR Venkatachalam and SGM Balasundaram. The first draft of the manuscript was written by KR Venkatachalam. JN Krishnan performed early conception and approved the final manuscript.
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Venkatachalam, K.R., Gautham, S.M.B. & Nambi Krishnan, J.N. Desalination characteristics of new blend membranes based on sulfonated polybenzimidazole and sulfonated poly(arylene ether sulfone). Polym. Bull. 80, 7805–7824 (2023). https://doi.org/10.1007/s00289-022-04428-3
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DOI: https://doi.org/10.1007/s00289-022-04428-3