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首页> 外文期刊>Journal of Applied Polymer Science >Solvent and pH resistance of surface crosslinked chitosan/poly(acrylonitrile) composite nanofiltration membranes
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Solvent and pH resistance of surface crosslinked chitosan/poly(acrylonitrile) composite nanofiltration membranes

机译：表面交联的壳聚糖/聚丙烯腈复合纳滤膜的耐溶剂性和pH值

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摘要

The resistance of novel surface crosslinked Chitosan/poly(acrylonitrile) (PAN) composite nanofiltration (NF) membranes to pH and organic solvents was studied with respect to the effects of crosslinking parameters, namely, glutaraldehyde concentration and crosslinking time. The pH resistance was determined by permeation of aqueous acidic (pH 2.5) and basic (pH 11) solutions as well as swelling studies in the pH range of 2.5-11. The solvent resistance was determined by swelling, immersion, and permeation studies with several industrially important organic solvents, namely methanol, ethanol, iso-propanol, methyl ethyl ketone, ethyl acetate and hexane. It was observed that the crosslinked composite membranes maintain the permeate fluxes for test solvents for 2 h of continuous operation without any significant change in flux. SEM studies on membrane samples after immersion as well as permeation with the above-mentioned solvents indicated that the membrane morphology was maintained. The results are explained in terms of solvent-membrane polar and hydrophobic interactions, using solubility parameters of membrane and solvents and dielectric constants of solvents. Pure water flux and polyethylene glycol transmission data indicated that at pH 2.5 and 11, the membrane stability increased with increasing glutaraldehyde concentration and was much better at pH 11 than at pH 2.5. All surface crosslinkcd membranes showed reduced swelling between pH 4-10. (C) 2000 John Wiley & Sans, Inc. [References: 22]
机译：针对交联参数，即戊二醛浓度和交联时间的影响，研究了新型表面交联的壳聚糖/聚丙烯腈（PAN）复合纳米过滤（NF）膜对pH和有机溶剂的耐受性。通过在酸性（pH 2.5）和碱性（pH 11）水溶液中渗透以及在2.5-11的pH范围内进行溶胀研究来确定pH值。通过使用几种工业上重要的有机溶剂，即甲醇，乙醇，异丙醇，甲基乙基酮，乙酸乙酯和己烷，进行溶胀，浸没和渗透研究，确定了耐溶剂性。可以观察到，交联的复合膜在连续操作2小时的时间内保持测试溶剂的渗透通量，而通量没有任何明显变化。浸没后以及用上述溶剂渗透后对膜样品进行的SEM研究表明，膜的形态得以保持。使用膜和溶剂的溶解度参数以及溶剂的介电常数，根据溶剂-膜的极性和疏水相互作用来解释结果。纯净水通量和聚乙二醇传递数据表明，在pH 2.5和11时，膜稳定性随戊二醛浓度的增加而增加，在pH 11时比在pH 2.5时要好得多。所有表面交联的膜在pH 4-10之间均显示出降低的溶胀。 （C）2000 John Wiley＆Sans，Inc. [参考：22]

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