Pore forming agent or hydrophilic additives are necessary for the optimization of membrane pore structure and surface physicochemical properties. Although it has been demonstrated that the blending additives tends to locate around membrane pore walls due to segregation and this would further leach out in practical operations, the impact of additives fate on membrane pore structure as well as sieving performance is almost overlooked in literatures. In this study, five kinds of Pluronic copolymers with different molecular architectures were employed for casting PSF UF membranes, and the fate of these copolymers in membrane matrix was explored by combing FTIR and XPS spectra with TG analysis. More importantly, the evolutions of membrane mean pore radius (r*) and radius distribution (σ) after additive leaching were quantitatively investigated based on the modified Steric Pore Model (SPM). In passive solute sieving experiments, the increment of r* and σ possessed positive correlation with the degree of polymerization (DP) of EO segments within the corresponding additive. The results of thermoporosimetry and saline filtration experiments further evidenced that such a correlation should be attributed not only to the steric hindrance of EO segment, but also to its hydration ability. Moreover, the intrinsic polymer geometry (r_ST) was also a crucial factor for understanding the evolutions of membrane pore structure during additive leaching. Especially for membranes having small r_ST, both the isopropanol (IPA) treatment and poly-dopamine (PDA) decoration experiments suggested that pore enlargement and the generation of new small cavities would occur simultaneously during additive leaching, making the prediction complicated. Finally, we proposed that the relative synthetic aperture (RSA) could serve as a complementary indicator for understanding and describing the pore enlargement behavior of a blended UF membrane. In an industrial point of view, it also offers a new way to evaluate and predict the long-term performance and stability of a blending modified porous membrane.

成孔剂或亲水性添加剂是优化膜孔结构和表面理化性质所必需的。虽然已经证明混合添加剂由于偏析而倾向于位于膜孔壁周围，这会在实际操作中进一步浸出，但文献中几乎忽略了添加剂命运对膜孔结构和筛分性能的影响。在本研究中，采用五种具有不同分子结构的 Pluronic 共聚物来浇铸 PSF UF 膜，并通过将 FTIR 和 XPS 光谱与 TG 分析相结合来探索这些共聚物在膜基质中的命运。更重要的是，基于改进的空间孔模型（SPM）定量研究了添加剂浸出后膜平均孔半径（r*）和半径分布（σ）的演变。在被动溶质筛分实验中，r*和σ的增量与相应添加剂内EO链段的聚合度（DP）呈正相关。热孔率法和盐水过滤实验的结果进一步证明，这种相关性不仅应归因于 EO 链段的位阻，还应归因于其水合能力。此外，本征聚合物几何形状（r 热孔率法和盐水过滤实验的结果进一步证明，这种相关性不仅应归因于 EO 链段的位阻，还应归因于其水合能力。此外，本征聚合物几何形状（r 热孔率法和盐水过滤实验的结果进一步证明，这种相关性不仅应归因于 EO 链段的位阻，还应归因于其水合能力。此外，本征聚合物几何形状（r_ST ) 也是了解添加剂浸​​出过程中膜孔结构演变的关键因素。特别是对于具有较小 r _{ST 的}膜，异丙醇 (IPA) 处理和聚多巴胺 (PDA) 装饰实验表明，在添加剂浸出过程中会同时发生孔扩大和新小孔洞的产生，使预测变得复杂。最后，我们提出相对合成孔径 (RSA) 可以作为理解和描述混合超滤膜孔径扩大行为的补充指标。从工业角度来看，它还提供了一种评估和预测混合改性多孔膜的长期性能和稳定性的新方法。