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Effect of aminated nanocrystal cellulose on proton conductivity and dimensional stability of proton exchange membranes

机译:胺化纳米晶纤维素对质子传导性和质子交换膜尺寸稳定性的影响

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A functionalized nanocrystal cellulose bearing amino and sulfonic acid groups (Am-sNCC) is prepared through a two-step chemical modification of microcrystal cellulose powders, first by sulfonic acid and then by a 3-trimethoxysilyl propyl ethylenediamine. The structure of Am-sNCC is characterized by Fourier Transform infrared spectroscopy (FT-IR), X-ray photoelectron spectroscopy (XPS), and X-ray diffraction (XRD). A sulfonated poly (ether ether ketone ketone) (Ph-SPEEKK) is synthesized via the direct sulfonation of a high-molecular-weight phenylated polymeric precursor under a mild reaction condition. The nanocomposite membranes composed of the Ph-SPEEKK matrix and the Am-NCC additive are successfully prepared by a solution casting method. The properties related to their application for proton exchange membranes are carefully evaluated. The nanocomposite membranes containing Am-sNCC, which served as a performance-enhancing component to form hydrogen bonding networks with the Ph-SPEEKK matrix, exhibited much improved dimensional stability, higher water absorption capacities, higher proton conductivity, better mechanical and fuel cell properties than the Ph-SPEEKK membrane.
机译:通过对微晶纤维素粉末进行两步化学修饰,首先通过磺酸,然后通过3-三甲氧基甲硅烷基丙基乙二胺,对氨基和磺酸基团(Am-sNCC)进行官能化制备纳米晶纤维素。 Am-sNCC的结构通过傅立叶变换红外光谱(FT-IR),X射线光电子能谱(XPS)和X射线衍射(XRD)来表征。磺化的聚(醚醚酮酮)(Ph-SPEEKK)是通过在温和的反应条件下将高分子量的苯基化聚合物前体直接磺化而合成的。通过溶液流延法成功地制备了由Ph-SPEEKK基质和Am-NCC添加剂组成的纳米复合膜。仔细评估了其在质子交换膜上的应用性能。含有Am-sNCC的纳米复合膜可作为性能增强组分,与Ph-SPEEKK基质形成氢键网络,与之相比,其尺寸稳定性,吸水能力,质子传导率,机械和燃料电池性能均得到了改善。 Ph-SPEEKK膜。

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