| 초록 |
Various functional groups onto the surface of vapor-grown carbon nanofiber (VGCNF) were introduced via electrophilic substitution reaction in polyphosphoric acid/phosphorous pentoxide medium. The amount of substituents onto VGCNF was varied with 4-40 wt% depending upon the reactivity of corresponding compounds such as 4-fluorobenzoic acid (FBA), 4- aminobenzoic acid (MBA), 4-bromobenzoic acid (BBA), 4-methoxybenzoic acid (MBA), 4-hydroxybenzoic acid (HBA), 4-ethoxybenzoic acid (EBA), 4-chlorobenzoic acid (CBA), 4-nitrobenzoic acid (NBA), and 4-iodobenzoic acid (IBA). They were uniformly bonded to the surface of VGCNF. On the basis of thermal decomposition studies on the samples by TGA, the percent weight loss occurred by stripping off the substituted adducts was greatly relying on the electron-donating and electron-withdrawing nature of substituents, although there were some exceptions due to the sublimation of compounds. The reaction progress and covalent attachment were conveniently monitored with FT-IR, scanning electron microscope (SEM), elemental analysis (EA), and thermogravimetric analysis (TGA). |
