Zhu, Jiadeng Lim, Jun Lee, Cheol-Ho Joh, Han-Ik Kim, Hwan Chul Park, Byoungnam You, Nam-Ho Lee, Sungho 2024-01-20T09:35:09Z 2024-01-20T09:35:09Z 2021-09-05 2014-05-05 0021-8995 https://pubs.kist.re.kr/handle/201004/126798 In this article, we detail an effective way to improve electrical, thermal, and gas barrier properties using a simple processing method for polymer composites. Graphene oxide (GO) prepared with graphite using a modified Hummers method was used as a nanofiller for r-GO/PI composites by in situ polymerization. PI composites with different loadings of GO were prepared by the thermal imidization of polyamic acid (PAA)/GO. This method greatly improved the electrical properties of the r-GO/PI composites compared with pure PI due to the electrical percolation networks of reduced graphene oxide within the films. The conductivity of r-GO/PI composites (30:70 w/w) equaled 1.1 x 10(1) S m(-1), roughly 10(14) times that of pure PI and the oxygen transmission rate (OTR, 30:70 w/w) was reduced by about 93%. The Young's modulus of the r-GO/PI composite film containing 30 wt % GO increased to 4.2 GPa, which was an approximate improvement of 282% compared with pure PI film. The corresponding strength and the elongation at break decreased to 70.0 MPa and 2.2%, respectively. (c) 2013 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2014, 131, 40177. English WILEY-BLACKWELL GRAPHENE OXIDE ELECTRICAL-PROPERTIES NANOCOMPOSITE FILMS GAS BARRIER SHEETS NANOSHEETS Multifunctional Polyimide/Graphene Oxide Composites via In Situ Polymerization Article 10.1002/app.40177 1 JOURNAL OF APPLIED POLYMER SCIENCE, v.131, no.9 JOURNAL OF APPLIED POLYMER SCIENCE 131 9 scie scopus 000334599600011 2-s2.0-84895062829 Polymer Science Polymer Science Article GRAPHENE OXIDE ELECTRICAL-PROPERTIES NANOCOMPOSITE FILMS GAS BARRIER SHEETS NANOSHEETS composites films electrical conductivity graphene oxide gas barrier