Multifunctional polyimide/graphene oxide composites via in situ polymerization |
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| Authors: | Jiadeng Zhu Jun Lim Cheol‐Ho Lee Han‐Ik Joh Hwan Chul Kim Byoungnam Park Nam‐Ho You Sungho Lee |
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| Affiliation: | 1. Carbon Convergence Materials Research Center, Institute of Advanced Composites Materials, Korea Institute of Science and Technology, Wanju‐gun, Jeollabuk‐do, Korea;2. Department of Organic Materials and Fiber Engineering, Chonbuk National University, Jeonju, Jeollabuk‐do, Korea;3. Department of Materials Science and Engineering, Hongik University 72‐1, Sangsu‐dong, Mapo‐gu, Korea |
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| Abstract: | 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 × 101 S m?1, roughly 1014 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. © 2013 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2014 , 131, 40177. |
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| Keywords: | composites films electrical conductivity graphene oxide gas barrier |
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