Lim, Jun Yeo, Hyeonuk Kim, Seo Gyun Park, Ok-Kyung Yu, Jaesang Hwang, Jun Yeon Goh, Munju Ku, Bon-Cheol Lee, Heon Sang You, Nam-Ho 2024-01-20T01:34:34Z 2024-01-20T01:34:34Z 2021-09-01 2017-04-01 1359-8368 https://pubs.kist.re.kr/handle/201004/122866 In this paper, we describe a functionalization route for synthesizing pyridine-functionalized reduced graphene oxide (Py-rGO) and the effect in the polymer matrix. In addition, polyimide (PI) nano composites with different loadings of Py-rGO are fabricated by in-situ polymerization. Py-rGO can perform as a filler component, which enhances the mechanical properties of the composites as well as promote polycondensation as a catalyst. As a result, the Pis containing Py-rGO are obtained with a high degree of imidization and the nanocomposite films show improved mechanical properties and oxygen barrier properties compared to pure PI. To be specific, the tensile strength and tensile modules of the nanocomposite with 0.5 wt% loading of Py-rGO are enhanced by about 406% (527 MPa) and 928% (59 GPa) in comparison to those of pure PI, respectively. Furthermore, the oxygen barrier properties of the composites are extremely improved. (C) 2017 Elsevier Ltd. All rights reserved. English ELSEVIER SCI LTD GRAPHENE-OXIDE POLYIMIDE NANOCOMPOSITES POLYMER NANOCOMPOSITES AROMATIC DIANHYDRIDES POLY(AMIC ACID) COMPOSITE FILMS TRANSPARENT IMIDIZATION NANOSHEETS ELECTRODES Pyridine-functionalized graphene/polyimide nanocomposites; mechanical, gas barrier, and catalytic effects Article 10.1016/j.compositesb.2016.12.057 1 COMPOSITES PART B-ENGINEERING, v.114, pp.280 - 288 COMPOSITES PART B-ENGINEERING 114 280 288 scie scopus 000401382600026 2-s2.0-85012980030 Engineering, Multidisciplinary Materials Science, Composites Engineering Materials Science Article GRAPHENE-OXIDE POLYIMIDE NANOCOMPOSITES POLYMER NANOCOMPOSITES AROMATIC DIANHYDRIDES POLY(AMIC ACID) COMPOSITE FILMS TRANSPARENT IMIDIZATION NANOSHEETS ELECTRODES Polyimide Reduced graphene oxide Nanocomposite Mechanical properties Oxygen barrier