
TGA plots of OPBI nanocomposite membranes with (A) OKao
Polymer nanocomposites of poly (4,4′-diphenylether-5,5′-bibenzimidazole) (OPBI) were prepared with two structurally different organoclays, namely, montmorillonite (OMMT) and kaolinite (OKao), to...
Proton direct transport channels incorporated with protonated …
2024年11月15日 · The TBPP-X-OPBI crosslinked membrane exhibits elevated ADL and a profusion of secondary amines and imines within the porphyrin hyper-crosslinked structure, which collectively facilitates the formation of a more compact hydrogen bond network for enhanced proton hopping transport.
Improving the ohmic polarization of high-temperature proton …
2024年3月1日 · Abbreviations: DMAc = N, N-dimethylacetamide; OPBI = poly(4,4′-diphenylether-5,5′-bibenzimidazole); TGA = thermogravimetric analysis; XPS = X-ray photoelectron spectroscopy. The success of the crosslinking reaction was further confirmed by …
Application of polybenzimidazole as a panchromatic ultraviolet …
2019年1月10日 · In this study, polybenzimidazole (OPBI) with panchromatic UV absorption was prepared by solution polycondensation and then used as a light stabilizer to improve the UV-resistance properties of PVC.
朱广山/呼微/卢云峰等最新成果:提出质子传导新机制,破解高温 …
在本文中,朱广山、呼微、卢云峰等作者将 磷酸掺杂 的 多孔芳香骨架 (paf-6-pa)引入至 聚【2, 2′-(氧二亚苯基)-5, 5′-苯并咪唑】 (opbi)中,采用直接溶液浇铸法成功地制备出一种新型 paf-6-pa/opbi 复合 ht-pems 用于 ht-pemfcs。研究发现,paf-6 中的碱性氮结构可以 ...
含有功能性交联剂的交联聚苯并咪唑作为高温质子交换膜:增强的 …
通过傅里叶变换红外(FT-IR)光谱、扫描电子显微镜(SEM)、能量色散X射线(EDX)和热重分析(TGA)对复合膜进行了表征。 结果表明,PBI被交联剂成功交联,膜均匀致密,具有优异的热稳定性。 磷酸 (PA) 掺杂交联膜具有优异的机械性能和质子传导性。 PA掺杂的PBI-ImCCP-20%在室温下的拉伸强度为20 MPa,−1在 160 °C 无加湿。 H 2 /O 2燃料电池组装有 PA 掺杂的 PBI-ImCCP-20% 膜,在 160 °C 无水条件下提供 749 mW cm -2的峰值功率密度。 PBI-ImCCP 系 …
聊聊最近很火的TGA(热重分析)检测 - 知乎 - 知乎专栏
热重分析 法(TGA)是在规定程序控制变化的温度范围内,测量被分析样品的重量相关量 (如质量、固体残留量或残留率等)随温度或时间的变化关系。 通过分析热重曲线,我们可以知道样品的热稳定性、热分解情况及其杂质组成、热分解产物等与质量相联系的信息。 热重量分析的主要特点是普适性高、样品消耗少、灵敏、能准确地测量物质的质量变化及变化的速率。 可以说,只要物质受热时会有组分逸出而引发质量的变化,都可以用热重量分析来研究。 下面以 QCC厂家 (网站 …
Fabricating a MOF Material with Polybenzimidazole into an …
2020年7月10日 · The pristine OPBI, and MOF nanofiller loaded membranes were doped with phosphoric acid (PA) to prepare proton exchange membranes (PEMs). Use of thermally stable, hydrophilic MOFs resulted in enhanced proton conductivity, higher PA retention capacity, and increased stability against oxidative degradation for the composite membrane than the ...
Performance of Quaternized Polybenzimidazole-Cross-Linked Poly ...
2020年12月7日 · They cross-linked bromomethylated poly(p-xylene) with poly(4,4′-diphenylether-5,5′-bibenzimidazole) (OPBI) and used trimethylamine as a quaternizing agent. Their results showed that the basic QA moieties helped to dissociate PA, establishing acid–base pairs, which enhanced proton conductivity and acid retention.
Symmetric sponge-like porous polybenzimidazole membrane …
2021年2月15日 · Here, a novel symmetric sponge-like porous poly [2,2’- (4,4′-oxybis (1,4-phenylene))-5,5′-bibenzimidazoles] (OPBI) membrane used for high temperature proton exchange membrane fuel cells was successfully fabricated by vapor-induced phase separation (VIPS).