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<p>Ultra-high molecular weight polypropylene (UHMWPP), being a typical polymeric material, holds great promise as a material in membrane separation. However, it is difficult to obtain an ideal membrane structure using traditional methods. In this work, the UHMWPP porous membranes featuring optimized pore structures were fabricated by the thermally induced phase separation (TIPS) method, using soybean oil (SO) and dibutyl phthalate (DBP) as mixed diluents. SO effectively reduces the viscosity of the polymer solution and enhances the compatibility of the system, which is crucial for achieving a uniform membrane structure. Additionally, the plasticizing ability of DBP improves the processability and mechanical properties of the membrane. The resulting UHMWPP membrane exhibits excellent pure water flux (504.25&#xa0;L m⁻² h⁻¹ bar⁻¹), high carbon black rejection rate (98%), remarkable mechanical strength (3.78&#xa0;MPa), and superior acid and alkali resistance. These properties make the porous and self-supporting UHMWPP membrane a promising candidate for wastewater treatment, with broad application prospects.</p> Graphical abstract <p></p>

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Optimization of pore structure and mechanical properties of ultra-high molecular weight polypropylene porous membranes

  • 期刊论文

  • 发表日期：

    2025年2月14日

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  • Wenqiang Gai,
  • Cuncheng Li,
  • Yuhao Ma,
  • Shanshan Xu,
  • Hongsheng Tan,
  • Xiuxue Guo,
  • Qinglu Zhang,
  • Changheng Liu,
  • Kaili Zhu,
  • Iqbal Waqar

摘要

Ultra-high molecular weight polypropylene (UHMWPP), being a typical polymeric material, holds great promise as a material in membrane separation. However, it is difficult to obtain an ideal membrane structure using traditional methods. In this work, the UHMWPP porous membranes featuring optimized pore structures were fabricated by the thermally induced phase separation (TIPS) method, using soybean oil (SO) and dibutyl phthalate (DBP) as mixed diluents. SO effectively reduces the viscosity of the polymer solution and enhances the compatibility of the system, which is crucial for achieving a uniform membrane structure. Additionally, the plasticizing ability of DBP improves the processability and mechanical properties of the membrane. The resulting UHMWPP membrane exhibits excellent pure water flux (504.25 L m⁻² h⁻¹ bar⁻¹), high carbon black rejection rate (98%), remarkable mechanical strength (3.78 MPa), and superior acid and alkali resistance. These properties make the porous and self-supporting UHMWPP membrane a promising candidate for wastewater treatment, with broad application prospects.

Graphical abstract