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首页> 外文期刊>Separation and Purification Technology >Novel sodium alginate-poly(N-isopropylacrylamide) semi-interpenetrating polymer network membranes for pervaporation separation of water + ethanol mixtures
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Novel sodium alginate-poly(N-isopropylacrylamide) semi-interpenetrating polymer network membranes for pervaporation separation of water + ethanol mixtures

机译：新型藻酸钠-聚（N-异丙基丙烯酰胺）半互穿聚合物网络膜，用于水和乙醇混合物的全蒸发分离

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Novel semi-interpenetrating polymer network (semi-IPN) membranes of sodium alginate (NaAlg) and thermoresponsive poly(N-isopropylacrylamide) (PNIPAAm) were prepared by free radical polymerization using potassium persulfate as an initiator. Membranes were crosslinked with glutaraldehyde and used in pervaporation (PV) separation of water-ethanol mixtures at varying feed compositions and temperatures. Membranes were characterized by Fourier transform infrared spectroscopy (FTIR) to assess intermolecular interactions. Thermogravimetry (TGA) was used to study their thermal stability. PV separation characteristics of the membranes showed a dependence on thermosensitive nature of NIPAAm. Increasing the NIPAAm content of the semi-IPN network resulted in an increased selectivity with a decreased permeation flux. The membrane containing 30 wt.% NIPAAm showed the highest selectivity of 18,881 with a flux of 0.137 kg/m2 h at 40 °C, i.e., the above lower critical solution temperature (LCST) of NIPAAm, but below its LCST, i.e., at 25 °C, it exhibited considerably a lower selectivity of 92 with a flux of 0.185 kg/m2 h for 15 wt.% water containing feed. Selectivity decreased with decreasing temperature at 15 wt.% water in the feed mixture below the LCST region, i.e., at 30 °C due to increase in the membrane pore size, thereby affecting the membrane selectivity with a considerable increase in flux of up to 0.225 kg/m2 h. The reported membranes are of the first kind in the membrane literature, wherein a thermoresponsive NIPAAm polymer is used with a hydrophilic NaAlg polymer to form the semi-IPN membrane for PV dehydration of ethanol.
机译：海藻酸钠（NaAlg）和热敏性聚（N-异丙基丙烯酰胺）（PNIPAAm）的新型半互穿聚合物网络（semi-IPN）膜是通过使用过硫酸钾作为引发剂的自由基聚合反应制备的。将膜与戊二醛交联，并在不同的进料组成和温度下用于水-乙醇混合物的全蒸发（PV）分离。通过傅立叶变换红外光谱（FTIR）表征膜，以评估分子间的相互作用。用热重分析法（TGA）研究其热稳定性。膜的PV分离特性显示出对NIPAAm的热敏性质的依赖性。半IPN网络中NIPAAm含量的增加导致选择性的提高和渗透通量的降低。包含30 wt。％NIPAAm的膜在40°C（即高于NIPAAm的下临界溶液温度（LCST），但低于其LCST，即在40°C下）下的最高选择性为18,881，通量为0.137 kg / m2 h。在25℃下，对于15wt。％的含水进料，其具有0.185kg / m 2 h的通量，具有较低的选择性92。进料混合物中水的含量在15％（重量）以下时，选择性会随LCST区域以下水的温度降低而降低，即在30°C时由于膜孔径的增加，从而影响膜的选择性，通量显着增加，最高可达0.225 kg / m2时所报道的膜是膜文献中的第一类膜，其中将热响应性NIPAAm聚合物与亲水性NaAlg聚合物一起使用以形成用于乙醇PV脱水的半IPN膜。

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