Preparation Of Graphite Intercalation Compound With Acetic Acid And Triethyl Phosphate And Study On Their Structure And Inflation Properties

Intercalation reaction between graphite layers is an important way to get new graphite materials with unique properties, usually called graphite intercalation compounds (GICs). By intercalating phosphorous containing compound, a kind of GIC with high flame retardant efficiency could be prepared and used as environmental-friendly flame retardants. However, few papers have been delivered on this topic. This thesis aims at preparation of GICs intercalated with triethyl phosphate (TEP) and acetic acid (AA) by chemical oxidizing method and electrochemical method. AA-GIC, TEP-GIC and AA-TEP-GIC are prepared by direct intercalation and step-wise intercalation methods. The synthesis conditions are investigated by separately discussion of different factors and orthogonal design. The structure of GIC and its expanded product is characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM). Expansion volume is evaluated and several concerned factors are discussed.The following conclusions can be obtained in the thesis. Successful preparation of GICs is proved by XRD. Compared with graphite, GIC shows diffraction peaks at lower angle, meaning large interlayer distance in GICs. AA-TEP-GIC prepared by step-wise chemical oxidizing method has larger interlayer distance. For chemical oxidizing method, the dosages of oxidizing agent and intercalating agent exert profound influences on expansion volume while voltage and reaction time are of importance for electrochemical method. By controlling the voltage, time and concentration, GIC with larger expansion volume can be prepared. AA-TEP-GIC step-wisely prepared has larger expansion volume than AA-GIC and TEP-GIC directly prepared. As proved by SEM, expanded GIC by electrochemical method presents larger and more homogenous hole structure. Expansion volume of GIC linearly increases with weight gain during reaction and weight loss during expansion. GIC as prepared has good expansion properties at low temperature according to the results of expansion volume at different temperature.