Muslimova Indira B, Zhumanazar Nurdaulet, Melnikova Galina B, Yeszhanov Arman B, Zhatkanbayeva Zhanna K, Chizhik Sergei A, Zdorovets Maxim V, Güven Olgun, Korolkov Ilya V
L.N. Gumilyov Eurasian National University Satpaev Str., 2 Astana 010000 Kazakhstan
The Institute of Nuclear Physics Ibragimov str. 1 Almaty 050032 Kazakhstan
RSC Adv. 2024 May 1;14(20):14425-14437. doi: 10.1039/d4ra02117g. eCollection 2024 Apr 25.
Stimuli-responsive membranes play an important role in the fields of biomedicine, food and chemical industries, and environmental applications, including separation of water-oil emulsions. In this study, we present a method to fabricate pH-sensitive membranes using UV-initiated RAFT graft copolymerization of styrene (ST) and acrylic acid (AA) on poly(ethylene terephthalate) (PET) track-etched membranes (TeMs). The optimization of polymerization conditions led to successful grafting of polystyrene (PS) and poly(acrylic acid) (PAA) onto PET TeMs, resulting in membranes with stable hydrophobicity and pH change responsiveness. The membranes show a contact angle of 65° in basic environments (pH 9) and 97° in acidic environments (pH 2). The membranes were characterized by atomic force microscopy (AFM), scanning electron microscopy with energy dispersive X-ray spectroscopy (SEM-EDX), thermogravimetric analyses (TGA), Fourier transform infrared spectroscopy (FTIR), contact angle (CA) methods. The PET TeMs--PS--PAA exhibited good performance in separating water-oil emulsions with a high efficiency of more than 90% and flux for direct chloroform-water 2500 L m h and reverse emulsions of benzene-water 1700 L m h. This method of preparing stimuli-responsive membranes with controlled wettability and responsiveness to environmental pH provides versatility in their use in separating two types of emulsions: direct and reverse.
刺激响应性膜在生物医学、食品和化学工业以及环境应用领域发挥着重要作用，包括水油乳液的分离。在本研究中，我们提出了一种通过在聚对苯二甲酸乙二酯（PET）径迹蚀刻膜（TeMs）上进行紫外线引发的苯乙烯（ST）和丙烯酸（AA）的可逆加成-断裂链转移（RAFT）接枝共聚来制备pH敏感膜的方法。聚合条件的优化使得聚苯乙烯（PS）和聚丙烯酸（PAA）成功接枝到PET TeMs上，从而得到具有稳定疏水性和pH变化响应性的膜。该膜在碱性环境（pH 9）中的接触角为65°，在酸性环境（pH 2）中的接触角为97°。通过原子力显微镜（AFM）、带有能量色散X射线光谱的扫描电子显微镜（SEM-EDX）、热重分析（TGA）、傅里叶变换红外光谱（FTIR）、接触角（CA）方法对膜进行了表征。PET TeMs-PS-PAA在分离水油乳液方面表现出良好的性能，对直接氯仿-水乳液的分离效率超过90%，通量为2500 L m⁻² h⁻¹，对苯-水反相乳液的通量为1700 L m⁻² h⁻¹。这种制备具有可控润湿性和对环境pH响应性的刺激响应性膜的方法，在分离直接和反相两种类型乳液的应用中具有通用性。
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