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Polyimide/Graphene Nanocomposites with Improved Gas Barrier and Thermal Properties due to a “Dual‐Plane” Structure Effect
Author(s) -
Liu Yiwu,
Liu Junjie,
Ding Qian,
Tan Jinghua,
Chen Zhiquan,
Chen Junyi,
Zuo Xuri,
Tang Ao,
Zeng Kejian
Publication year - 2018
Publication title -
macromolecular materials and engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.913
H-Index - 96
eISSN - 1439-2054
pISSN - 1438-7492
DOI - 10.1002/mame.201800053
Subject(s) - materials science , nanocomposite , exfoliation joint , graphene , polyimide , thermal stability , crystallinity , thermal expansion , graphite , in situ polymerization , composite material , chemical engineering , polymerization , polymer , nanotechnology , layer (electronics) , engineering
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 cm 3 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 T d5% 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.