| 초록 |
To covalently attach more reactive functional groups onto the surface of carbon nanomaterials such as vapor-grown carbon nanofibers (VGCNF) and multi-walled carbon nanotubes (MWNT), 4-(4-aminophenoxy)benzoic acid was prepared via two reaction steps. The reaction between 4-fluorobenzonitrile and 4-aminophenol afforded 4-(aminophenoxy) benzonitrile, which was subsequently hydrolyzed to afford 4-(4-aminophenoxy)benzoic acid. VGCNF and MWNT, respectively, were functionalized with 4-(aminophenoxy)benzoic acid in polyphosphoric acid (PPA)/phosphorous phentoxide (P2O5) medium via “direct” Friedel-Crafts acylation reaction to afford 4-(aminophenoxy)benzoyl-functionalized VGCNF (APF-VGCNT) and MWNT (APF-MWNT). They were blended with epoxy resin by simple mechanical stirring in dichloromethane, which was added to help efficient mixing. The thermal, mechanical and electrical properties of the nanocomposites were studied with respect to APF-VGCNF or APF- MWNT loads. |
