Fabrication of Thin-coated PDMS/PP Composite Membranes and Investigation of the Coating Formation Mechanism and the Removal Performance towards Dissolved Oxygen

IF 5.4 2区化学 Q2 CHEMISTRY, PHYSICAL

Colloids and Surfaces A: Physicochemical and Engineering Aspects Pub Date : 2026-10-15 DOI:10.1016/j.colsurfa.2026.142107

Xiaonan Fu, Zhihao Gao, Zhiyou Pu, Jingyu Chu, Biao Wu, Xiao Wu, Zhenyu Cui

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Abstract

Polypropylene (PP) hollow fiber degassing membrane is easy to be wetted by water during long-term operation due to its poor intrinsic hydrophobicity. In this study, PDMS/PP hydrophobic composite membrane was prepared via dip-coating polydimethylsiloxane (PDMS). In this process, the pre-crosslinking time was controlled to adjust the coating solution to the minimum viscosity capable of forming a continuous coating layer. Meanwhile, the spreading of PDMS on the membrane surface was promoted by regulating the PDMS concentration, coating time and drying temperature, ultimately producing a thin and uniform PDMS coating layer. This study elucidated the formation process and anti-wetting mechanism of the PDMS coating layer. The effects of PDMS concentration, coating time and drying temperature on the morphology of coating layer, hydrophobicity and degassing performance were systematically investigated. The results showed that the water contact angle of the prepared composite membrane increased to 107.5 °. The DO removal rate was 74% and retained approximately 90% of the degassing performance of the pristine PP membrane. However, after 2160 min of continuous operation, the DO removal rate can still remain stable at 70%, which suggested that both the anti-wetting performance and long-term operational stability were significantly superior to those of the PP substrate membrane. The fluorine-free, environmentally friendly and simple modification method used in this study achieves a synergistic enhancement in both degassing efficiency and operational stability, which provides technical support for the industrial application of high-performance hydrophobic degassing membranes.

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薄包覆PDMS/PP复合膜的制备、包覆机理及对溶解氧去除性能的研究

聚丙烯（PP）中空纤维脱气膜由于其固有疏水性差，在长期运行过程中容易被水浸湿。本研究通过浸涂聚二甲基硅氧烷（PDMS）制备了PDMS/PP疏水复合膜。在此过程中，通过控制预交联时间，将涂覆液调整到能够形成连续涂覆层的最小粘度。同时，通过调节PDMS浓度、涂膜时间和干燥温度，促进PDMS在膜表面的扩散，最终形成薄而均匀的PDMS涂膜层。本研究阐明了PDMS涂层的形成过程和抗润湿机理。系统考察了PDMS浓度、涂层时间和干燥温度对涂层形貌、疏水性和脱气性能的影响。结果表明，制备的复合膜的水接触角提高到107.5°。DO去除率为74%，保留了原始PP膜约90%的脱气性能。但在连续运行2160 min后，DO去除率仍能稳定在70%，说明其抗润湿性能和长期运行稳定性均明显优于PP基膜。本研究采用的无氟、环保、简单的改性方法实现了脱气效率和运行稳定性的协同提升，为高性能疏水脱气膜的工业应用提供了技术支持。

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来源期刊

Colloids and Surfaces A: Physicochemical and Engineering Aspects 化学-物理化学

CiteScore

8.70

自引率

9.60%

发文量

2421

审稿时长

56 days

期刊介绍： Colloids and Surfaces A: Physicochemical and Engineering Aspects is an international journal devoted to the science underlying applications of colloids and interfacial phenomena. The journal aims at publishing high quality research papers featuring new materials or new insights into the role of colloid and interface science in (for example) food, energy, minerals processing, pharmaceuticals or the environment.