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Structural and electrochemical studies of heterogeneous ion exchange membranes based on polyaniline-coated cation exchange resin particles

机译：基于聚苯胺涂层阳离子交换树脂颗粒的非均相离子交换膜的结构和电化学研究

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The idea to modify polystyrene sulfonated divinyl benzene (PSS/DVB) resin particles with electroactive polyaniline (PANI) prior to incorporating these into a polymer matrix (PVC in the present case) has been trialed in this study. The extent of PANI layering on resin particles was controlled by changing polymerization time during aniline polymerization reaction. The PANI modified PVC-PSS/DVB heterogeneous cation exchange membranes were characterized for their morphological, physical and structural properties using scanning electron microscopy (SEM), measurements of water uptake and ion exchange capacity, Fourier transform infrared spectroscopy (FTIR) and thermogravimetric analysis (TGA). SEM micrographs showed PANI layering around PSS/DVB particles and shape change depending on aniline polymerization time that has been also confirmed by FTIR spectra through growing PANI peaks. PANI layering around resin particles resulted in lower water uptake of PANI modified resin membranes as compared to unmodified PVC-PSS/DVB membranes. The ion exchange capacity decreased initially at shorter PANI deposition times and increased slightly on prolonged deposition because of the cation character of doped PANI that was originated by excessive layering around the particles. TGA curves showed PANI degradation in addition to PVC and PSS/DVB resin degradations thus decreasing the overall thermal stability of PANI modified membranes. Ion transport studies in a two-compartment cell showed significantly different transport numbers for monovalent (Na+) and divalent (Ca2+) cations that decreased by increasing PANI layering around resin particles. The difference between transport numbers, a measure of membrane permselectivity, increased by increasing PANI deposition showing the strong screening effects of PANI layering.
机译：在本研究中，在将它们掺入聚合物基质之前，将聚苯乙烯磺化二乙烯基苯（PSS / DVB）树脂颗粒改性聚苯乙烯磺化二乙烯基苯（PSS / DVB）树脂颗粒（PVC）已经在本研究中进行了试验。通过在苯胺聚合反应期间改变聚合时间来控制树脂颗粒上的PANI层状的程度。 PANI改性的PVC-PSS / DVB异质阳离子交换膜的特征在于，使用扫描电子显微镜（SEM），测水和离子交换能力测量，傅里叶变换红外光谱（FTIR）和热重分析（ TGA）。 SEM显微照片显示围绕PSS / DVB颗粒的PANI分层，并根据苯胺聚合时间通过生长的PANI峰进行苯胺聚合时间。与未修饰的PVC-PSS / DVB膜相比，树脂颗粒周围的PANI分层导致PANI改性树脂膜的较低。离子交换容量最初在短的Pani沉积时间上较短，并且由于掺杂的PANI的阳离子特性源于颗粒周围过量分层，因此延长沉积的延长沉积略微增加。除了PVC和PSS / DVB树脂之外，TGA曲线还显示PANI降解，从而降低了PANI改性膜的总热稳定性。双隔室细胞中的离子传输研究对于一价（Na +）和二价（Ca2 +）阳离子的阳离子显着不同的传输号，其通过增加树脂颗粒周围的PANI分层而降低。通过增加PANI分层的泛池沉积，运输数量的差异，膜渗透性的衡量标准增加。

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  • 来源
    《RSC Advances》 |2016年第116期|共9页
  • 作者

    Malik Muhammad Salman; Qaiser Asif Ali; Arif Muhammad Ahmed;

  • 作者单位

    Univ Engn &

    Technol Dept Polymer &

    Proc Engn Lahore 54890 Pakistan;

    Univ Engn &

    Technol Dept Polymer &

    Proc Engn Lahore 54890 Pakistan;

    Univ Engn &

    Technol Dept Polymer &

    Proc Engn Lahore 54890 Pakistan;

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  • 正文语种 eng
  • 中图分类 化学;
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