Sulfonated poly(ether ether ketone) composite membranes based on amino‐modified halloysite nanotubes that effectively immobilize phosphotungstic acid,Journal of Polymer Science

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Sulfonated poly(ether ether ketone) composite membranes based on amino‐modified halloysite nanotubes that effectively immobilize phosphotungstic acid
Journal of Polymer Science ( IF 3.9 ) Pub Date : 2020-05-22 , DOI: 10.1002/pol.20200035
Shaojian He _{1,

2} , Wenxu Dai ₂ , Shaoxiong Zhai ₁ , Hao Song ₁ , Jun Lin _{1,

2}

Affiliation

In this work, we prepared amino‐modified halloysite nanotubes (PEI‐DHNTs) via the co‐deposition of self‐polymerized dopamine and polyethylenimine (PEI) on the surface of nanotubes, which was confirmed by X‐ray photoelectron spectroscopy (XPS) and Thermogravimetric analysis (TGA). A series of composite proton exchange membranes (PEMs) were prepared by incorporating PEI‐DHNTs and phosphotungstic acid (HPW) into sulfonated poly(ether ether ketone) (SPEEK). It was found that both PEI‐DHNTs and HPW were well dispersed in the polymer matrix, exhibiting excellent filler‐matrix compatibility. The composite membranes demonstrated enhanced proton conductivity, reaching as high as 0.078 S cm⁻¹ with 33.3 wt.% HPW loading, which was ~90% higher than that of SPEEK control membrane. Such improvement was mainly attributed to the strong acid–base pairs formed by PEI‐DHNT with both SPEEK and HPW, which shortened proton hopping distance and created more continuous proton conduction pathways. Furthermore, the membrane conductivity remained almost constant after 1 year's immersion in liquid water, indicating the successful immobilization of HPW in the composite membranes.

中文翻译：

基于氨基修饰的埃洛石纳米管的磺化聚醚醚酮复合膜，可有效固定磷钨酸

在这项工作中，我们通过自聚合多巴胺和聚乙烯亚胺（PEI）在纳米管表面上的共沉积制备了氨基修饰的埃洛石纳米管（PEI-DHNTs），这已通过X射线光电子能谱（XPS）和热重分析（TGA）。通过将PEI-DHNT和磷钨酸（HPW）掺入磺化聚醚醚酮（SPEEK）中，制备了一系列复合质子交换膜（PEM）。发现PEI-DHNT和HPW均很好地分散在聚合物基质中，表现出出色的填料-基质相容性。复合膜表现出增强的质子传导性，高达0.078 S cm ^-1HPW负载量为33.3 wt。％，比SPEEK对照膜高约90％。这种改善主要归因于PEI-DHNT与SPEEK和HPW形成的强酸碱对，这缩短了质子跳跃距离并创建了更连续的质子传导途径。此外，将膜电导率浸入液态水中1年后几乎保持恒定，这表明HPW已成功固定在复合膜中。

更新日期：2020-05-22

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