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首页> 外文期刊>Journal of Applied Polymer Science >Preparation and characterization of novel chitosan-based mixed matrix membranes resistant in alkaline media
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Preparation and characterization of novel chitosan-based mixed matrix membranes resistant in alkaline media

机译：新型耐碱性介质的壳聚糖基混合基质膜的制备与表征

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In this work, mixed matrix membranes (MMMs) based on chitosan (CS) and different fillers (room temperature ionic liquid [emim][OAc] (IL), metallic Sn powder, layered titanosilicate AM-4 and layered stannosilicate UZAR-S3) were prepared by solution casting. The room temperature electrical conductivity and electrochemical response in strong alkaline medium were measured by electrochemical impedance spectroscopy and cyclic voltammetry (CV). The ionic conductivity of pure CS membranes was enhanced, from 0.070 to 0.126 mS cm(-1), for the pristine CS and Sn/CS membranes, respectively, as a function of the hydrophilic nature of the membrane and the coordination state of Sn. This hydrophilic and charge nature was corroborated by water uptake measurements, where only the introduction of IL in the CS membrane led to a water uptake of 3.96 wt %, 20 or 30 times lower than the other membranes. Good thermal and chemical stability in alkaline media were observed by thermogravimetric analyses and X-ray photoelectron spectroscopy analyses, respectively, and good interaction between CS and the fillers observed by X-ray diffraction, scanning electron microscopy and CV. Thus, thin CS-based MMMs (40-139 mu m), resistant in high alkaline media, show higher conductivity than pure CS membranes, especially those fillers containing tin, and although the electrochemical performance is lower than commercially available anion-exchange membranes they have potential in pervaporation. (c) 2015 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015, 132, 42240.
机译：在这项工作中，基于壳聚糖（CS）和不同填料（室温离子液体[emim] [OAc]（IL），金属锡粉，层状钛硅酸盐AM-4和层状锡硅酸盐UZAR-S3）的混合基质膜（MMM）通过溶液流延制备。通过电化学阻抗谱和循环伏安法（CV）测量了强碱性介质中的室温电导率和电化学响应。原始CS膜和Sn / CS膜的纯CS膜的离子电导率分别从0.070增强到0.126 mS cm（-1），这取决于膜的亲水性和Sn的配位态。通过吸水率测量证实了这种亲水性和电荷性质，其中仅在CS膜中引入IL导致吸水率为3.96 wt％，比其他膜低20或30倍。通过热重分析和X射线光电子能谱分析分别在碱性介质中观察到了良好的热稳定性和化学稳定性，并通过X射线衍射，扫描电子显微镜和CV观察到CS与填料之间的良好相互作用。因此，在高碱性介质中具有抗性的薄CS基MMM（40-139μm）显示出比纯CS膜更高的电导率，尤其是那些含锡的填料，尽管其电化学性能低于市售阴离子交换膜有潜在的渗透作用。 （c）2015 Wiley Periodicals，Inc. J. Appl。 Polym。科学2015，132，42240。

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