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Enhanced electrical, mechanical and thermal properties of chemically modified graphene-reinforced polybenzimidazole nanocomposites
Bulletin of Materials Science ( IF 1.8 ) Pub Date : 2020-08-13 , DOI: 10.1007/s12034-020-02187-3
Baban Dey , Md Wasi Ahmad , Anood Almezeni , Gautam Sarkhel , Dibyendu Sekhar Bag , Arup Choudhury

Chemically modified graphene-reinforced polybenzimidazole (PBI) nanocomposites were prepared by liquid-phase exfoliation of graphene oxide (GO) and reduced graphene oxide (rGO) in methanesulphonic acid (CH 4 O 3 S), followed by in-situ polymerization using GO–CH 4 O 3 S and rGO–CH 4 O 3 S suspensions as reaction media. Various reducing agents were used to produce rGOs and their reducing efficiency was examined to attain highly graphitic structure and excellent electrical conductivity of the resulting rGOs. The results of Raman, Fourier transform infrared and X-ray photoelectron spectroscopy indicate higher extent of reduction of GO with hydrazine compared to other reducing agents. The PBI nanocomposite containing 10 wt% rGO derived from hydrazine reduction reaction (rGO–H) exhibits the highest dc conductivity of 2.77 × 10 −3 S cm −1 at room temperature, which is 11 orders of magnitude higher than pure PBI. The thermal annealing treatment at 350°C resulted in a substantial increase in dc conductivity of the PBI/GO nanocomposite, whereas the enhancement of conductivity is much less for the PBI/rGO nanocomposites. Compared to pure PBI, both tensile strength and Young’s modulus enhanced by 3.4 times and 6.9 times, respectively, for the PBI nanocomposites with 10 wt% GO content, which is ascribed to strong interfacial interactions and subsequent effective stress transfer between the PBI matrix and GO. The PBI/rGO nanocomposites exhibited relatively lower tensile strength/modulus compared to the GO-reinforced nanocomposite. The thermal stability of PBI was significantly improved upon the incorporation of both GO and rGO nanosheets, whereas higher thermal stability was achieved for rGO-reinforced nanocomposites.

中文翻译:

化学改性石墨烯增强聚苯并咪唑纳米复合材料的电、机械和热性能增强

通过在甲磺酸 (CH 4 O 3 S) 中液相剥离氧化石墨烯 (GO) 和还原氧化石墨烯 (rGO),然后使用 GO– 进行原位聚合,制备了化学改性的石墨烯增强聚苯并咪唑 (PBI) 纳米复合材料。 CH 4 O 3 S 和 rGO–CH 4 O 3 S 悬浮液作为反应介质。使用各种还原剂来生产 rGO,并检查它们的还原效率以获得所得 rGO 的高度石墨结构和优异的导电性。拉曼、傅里叶变换红外和 X 射线光电子能谱的结果表明,与其他还原剂相比,肼对 GO 的还原程度更高。含有 10 wt% 来自肼还原反应 (rGO-H) 的 rGO 的 PBI 纳米复合材料表现出最高的直流电导率 2。室温下为 77 × 10 -3 S cm -1,比纯 PBI 高 11 个数量级。350°C 的热退火处理导致 PBI/GO 纳米复合材料的直流电导率显着增加,而 PBI/rGO 纳米复合材料的电导率增强要小得多。与纯 PBI 相比,具有 10 wt% GO 含量的 PBI 纳米复合材料的拉伸强度和杨氏模量分别提高了 3.4 倍和 6.9 倍,这归因于 PBI 基体和 GO 之间强的界面相互作用和随后的有效应力转移. 与GO增强纳米复合材料相比,PBI/rGO纳米复合材料表现出相对较低的拉伸强度/模量。加入GO和rGO纳米片后,PBI的热稳定性显着提高,
更新日期:2020-08-13
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