Abstract Permeability and mechanical strength normally present an opposite trend for separation membranes. There is a trade-off line of permeability vs. tensile strength for the prepared poly(vinylidene fluoride) (PVDF) membranes via thermally induced phase separation (TIPS) method. In this work, TIPS-prepared PVDF membranes were fabricated with water (PVDFT-water) and air (PVDFT-air) as quenching bath for comparatively studying. PVDFT-air membranes present larger average pore size, higher permeability and better mechanical strength than those of PVDFT-water membranes due to the lower cooling rate of air bath. It is wonderful that all PVDFT-air membranes can break though the trade-off line of permeability vs. tensile strength of TIPS-prepared PVDF membranes. The optimal membrane (M-A30) shows superior performance, such as ultrahigh water flux of 3275 L m−2 h−1·bar−1 and tensile strength of 5.7 MPa. Additionally, this research provides a feasible method to regulate the morphology, pore size and permeability of TIPS-prepared PVDF membranes.

中文翻译：

---

突破 TIPS 制备的 PVDF 膜的渗透性与拉伸强度的上键

摘要 分离膜的渗透性和机械强度通常呈现相反的趋势。对于通过热致相分离 (TIPS) 方法制备的聚偏二氟乙烯 (PVDF) 膜，存在渗透率与拉伸强度的折衷线。在这项工作中，以水（PVDFT-水）和空气（PVDFT-空气）为淬火浴制备 TIPS 制备的 PVDF 膜以进行比较研究。由于空气浴的冷却速度较低，PVDFT-空气膜比PVDFT-水膜具有更大的平均孔径、更高的渗透性和更好的机械强度。令人惊奇的是，所有 PVDFT 空气膜都可以通过 TIPS 制备的 PVDF 膜的渗透性与拉伸强度的折衷线而破裂。最佳膜（M-A30）表现出卓越的性能，如3275 L m-2 h-1·bar-1的超高水通量和5.7 MPa的抗拉强度。此外，这项研究为调节 TIPS 制备的 PVDF 膜的形态、孔径和渗透性提供了一种可行的方法。