Polyimide/Graphene Nanocomposites with Improved Gas Barrier and Thermal Properties due to a “Dual‐Plane” Structure Effect |
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| Authors: | Yiwu Liu Junjie Liu Qian Ding Jinghua Tan Zhiquan Chen Junyi Chen Xuri Zuo Ao Tang Kejian Zeng |
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| Affiliation: | 1. Key Laboratory of Advanced Packaging Materials and Technology of Hunan Province, School of Packaging and Materials Engineering, Hunan University of Technology, Zhuzhou, P. R. China;2. Hubei Nuclear Solid Physics Key Laboratory, Department of Physics, Wuhan University, Wuhan, P. R. China |
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| Abstract: | Graphene nanosheets are prepared by solution‐phase exfoliation of graphite and successfully incorporated with polyimide to obtain polyimide/graphene (DABPI/G) nanocomposites via in situ polymerization. Compared with those of pure DABPI, the DABPI/G nanocomposites exhibit better barrier and thermal properties. The oxygen and water vapor transmission rates of the DABPI/G (0.5 wt%) nanocomposite are 0.69 cm3 m?2 d?1 and 0.44 g m?2 d?1, respectively, which are 92 and 85% lower than those of pure DABPI. Meanwhile, the DABPI/G (0.5 wt%) nanocomposite exhibits excellent thermal stability with a Td5% of 578 °C and a coefficient of thermal expansion of ?0.19 ppm K?1. The excellent barrier and thermal properties of DABPI/G nanocomposites are mainly attributed to the fine dispersion and orientation of the graphene nanosheets, increased crystallinity, and low free volume of the DABPI matrix. These are the result of the “dual‐plane” structure effect, which is the synergistic orientation effect between the rigid planar molecular chains of DABPI and the nanosheets of graphene. |
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| Keywords: | gas barriers graphene nanocomposites polyimide thermal properties |
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