In this study, styrene (St) and methyl methacrylate (MMA) were copolymerized in semicontinuous heterophase using Hitenol-BC10 (HBC10) as polymerizable surfactant and ammonium persulfate as initiator to obtain copolymers of poly(St-co-MMA). The effects of St/MMA weight ratio and surfactant concentration on kinetics, and colloidal properties of latexes were studied. Copolymers and latexes were characterized by scanning electron microscopy, thermogravimetric analysis (TGA), gel permeation chromatography (GPC), Fourier transform infrared (FTIR) spectroscopy, and X-ray diffraction analysis. Fast reaction rates under monomer starved conditions and high conversions (>85%) were observed in all cases, with a weight-average molecular weight in the range of 2.10 × 10⁶ to 0.96 × 10⁶ g mol⁻¹, decreasing with the HBC10 concentration due to an effect of chain transference to surfactant. Stable latexes with spherical particles with average diameter in the interval of 65–41 nm and Z-potential in the interval of −68.24 to −38.44 mV were obtained. Copolymers were sulfonated using acetyl sulfate as sulfonating agents and subsequently used for filtration membrane fabrication through the phase inversion method. Membranes were tested in simulated seawater filtration (3.5% NaCl) under constant pressure. At a pressure of 20 psia, permeated flux (J) of pure water and salt rejection (R) varied from 13.8 to 20.5 L m⁻² h⁻¹ and 37.8%–50.7%, respectively. It was concluded that membrane's performance is dependent on copolymer composition, the crystallinity of copolymers, and the ionic exchange capacity of membranes, being the best membrane composed of 90/10 of St-to-MMA weight ratio and using a monomer-to-surfactant weight ratio of 29.9.

中文翻译：

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通过半连续多相聚合合成磺化聚（苯乙烯-共聚-甲基丙烯酸甲酯）用于过滤膜

在这项研究中，苯乙烯 (St) 和甲基丙烯酸甲酯 (MMA) 在半连续多相中使用 Hitenol-BC10 (HBC10) 作为可聚合表面活性剂和过硫酸铵作为引发剂共聚，以获得聚 (St- co- MMA)共聚物。研究了 St/MMA 重量比和表面活性剂浓度对胶乳动力学和胶体性质的影响。共聚物和乳胶通过扫描电子显微镜、热重分析 (TGA)、凝胶渗透色谱 (GPC)、傅里叶变换红外 (FTIR) 光谱和 X 射线衍射分析进行表征。在所有情况下均观察到单体缺乏条件下的快速反应速率和高转化率 (>85%)，重均分子量范围为 2.10 × 10 ⁶至 0.96 × 10 ⁶ g mol ^-1，由于链转移到表面活性剂的影响，随着 HBC10 浓度的增加而降低。获得了具有平均直径在 65-41 nm 范围内和Z电位在 -68.24 到 -38.44 mV范围内的球形颗粒的稳定乳胶。使用乙酰硫酸盐作为磺化剂磺化共聚物，随后通过相转化法用于过滤膜制造。在恒定压力下在模拟海水过滤（3.5% NaCl）中测试膜。在 20 psia 的压力下，纯水的渗透通量 ( J ) 和脱盐率 ( R ) 从 13.8 到 20.5 L m ^-2  h ^{-1 不等}和 37.8%–50.7%，分别。得出的结论是，膜的性能取决于共聚物的组成、共聚物的结晶度和膜的离子交换能力，最好的膜由 90/10 的 St 与 MMA 重量比组成并使用单体与表面活性剂重量比为 29.9。