过氧乙酸预氧化插层膨胀法制备膨胀石墨及对其导电性能的影响

本文以过氧乙酸为预氧化剂、浓硫酸为插层剂,采用化学氧化法制备了不同氧化程度的石墨层间化合物,并对其进行微波膨胀获得膨胀石墨. 本文采用SEM、XRD和FT-IR对石墨层间化合物和膨胀石墨的形貌、结构和含氧官能团的变化进行表征,研究预氧化时间对膨胀石墨膨胀容积及导电性能的影响. 结果表明,当预氧化时间为20 min时插层膨胀最好,获得的膨胀石墨膨胀容积达到275 mL/g,此时所制备的柔性石墨箔电导率达到2000 S/m,表现出极好的导电性能. 本工作为绿色制备具有高膨胀容积的膨胀石墨提供了思路.

Preparation of expanded graphite by peracetic acid pre-oxidation intercalation expansion method and its effect on electrical conductivity

In this work, the graphite intercalation compounds with different oxidation degrees are prepared via a chemical oxidation method, using the peracetic acid as a preoxidant and the concentrated sulfuric acid as an intercalating agent. Further, expanded graphite is prepared by microwave-heating expansion. SEM, XRD, and FT-IR are used to characterize the morphology, structure, and changes of oxygen-containing functional groups of graphite intercalation compounds and expanded graphite. Furthermore, the effect of pre-oxidation time on the expansion volume and electrical conductivity of expanded graphite is studied. The results show that when the preoxidation time is 20 min, the intercalation expansion is the best, the expansion volume of the obtained expanded graphite reaches 275 mL/g, and the electrical conductivity of the prepared flexible graphite foil reaches 2000 S/m, showing excellent performance. Electrical conductivity. This work provides an idea for the green preparation of expanded graphite with high expansion volume. The results show that the intercalation expansion is the best when the pre-oxidation reaction time is 20 min, and the expansion volume of expanded graphite reaches the maximum of 275 mL/g. Under the optimal expansion effect, the conductivity of the prepared flexible graphite foil reaches 2000 S/m, showing excellent electrical conductivity. This work provides an idea for the green preparation of expanded graphite with high expansion volume.