| 초록 |
Polyimide (PI) nanocomposites were prepared with exfoliated graphene oxide (GO) and chemically reduced GO (rGO) nanosheets by thermal imidization of polyamic acid (PAA)/GO and PAA/rGO composites, and their morphologies and mechanical and electrical properties were explored. The GO was reduced with several reducing agents such as hydrazine, dimethylformamide, and L-ascorbic acid. Graphene has opened up a new opportunity to introduce it into a PI matrix for developing PI-based nanocomposites with superior properties. The possible non-covalent hydrogen bondings (between functional groups of the GO/rGO and PAA) as well as a simultaneous partial in-situ reaction could suppress the phase separation during the thermal imidization process. The prepared PI/GO (rGO) nanocomposites showed improved mechanical, electrical and thermal properties compared to its pure PI. Their properties were strongly correlated with the reduced states of the used rGOs. |
