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<p>The separation performance of polyamide (PA) membranes is governed by their cross-linking structure, a critical parameter dictated by the diffusion kinetics of 1,3-phenylenediamine (MPD) during interfacial polymerization. Herein, we introduce sodium dodecyl sulfate (SDS) into the aqueous phase to construct a strong, short-range hydrogen-bonding network with MPD molecules. This interaction effectively impedes MPD diffusion to the biphasic interface, thereby promoting the formation of a highly cross-linked PA structure. Consequently, the optimized S-PA membrane exhibits a more uniform network structure and a narrower pore size distribution. The results show that the membrane achieves water permeance of 13.5&#xa0;L m<sup>− 2</sup> h<sup>− 1</sup> Mpa<sup>− 1</sup> coupled with a NaCl rejection exceeding 97.1%, representing a 2.5-fold enhancement in permeance compared to conventional I-PA membranes. Notably, the membrane maintains stable performance over a 350-hour test. This study elucidates the pivotal role of hydrogen-bonding networks in modulating interfacial polymerization and offers a versatile strategy for designing separation membranes with simultaneously high permeance and antifouling properties.</p>

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Regulating MPD diffusion to enhance polyamide membrane performance via hydrogen-bonding network

  • 期刊论文

  • 发表日期：

    2026年8月2日

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  • Yuanlin Li,
  • Tingting Du,
  • Xuechun Li,
  • Desheng Xu,
  • Yingxiao Gong,
  • Yun Jin

摘要

The separation performance of polyamide (PA) membranes is governed by their cross-linking structure, a critical parameter dictated by the diffusion kinetics of 1,3-phenylenediamine (MPD) during interfacial polymerization. Herein, we introduce sodium dodecyl sulfate (SDS) into the aqueous phase to construct a strong, short-range hydrogen-bonding network with MPD molecules. This interaction effectively impedes MPD diffusion to the biphasic interface, thereby promoting the formation of a highly cross-linked PA structure. Consequently, the optimized S-PA membrane exhibits a more uniform network structure and a narrower pore size distribution. The results show that the membrane achieves water permeance of 13.5 L m− 2 h− 1 Mpa− 1 coupled with a NaCl rejection exceeding 97.1%, representing a 2.5-fold enhancement in permeance compared to conventional I-PA membranes. Notably, the membrane maintains stable performance over a 350-hour test. This study elucidates the pivotal role of hydrogen-bonding networks in modulating interfacial polymerization and offers a versatile strategy for designing separation membranes with simultaneously high permeance and antifouling properties.