膜
热稳定性
磺酸
高分子化学
化学
傅里叶变换红外光谱
纳米复合材料
纤维素
乙二胺
质子交换膜燃料电池
乙醚
X射线光电子能谱
化学稳定性
化学工程
聚合物
电导率
无机化学
有机化学
物理化学
工程类
生物化学
作者
Qi Zhao,Yingcong Wei,Chuangjiang Ni,Xun Hu,Baijun Liu,Jing Liu,Mingyao Zhang,Yongfeng Men,Zhaoyan Sun,Haiming Xie,Wei Hu,Yunfeng Lu
标识
DOI:10.1016/j.apsusc.2018.10.063
摘要
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.
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