Journal
APPLIED SURFACE SCIENCE
Volume 314, Issue -, Pages 991-999Publisher
ELSEVIER
DOI: 10.1016/j.apsusc.2014.06.130
Keywords
Polyimide; Functionalizied graphene oxide (FGO); Nanocomposites; Mechanical properties; Thermal properties
Categories
Funding
- National Natural Science Foundation of China [21264001, 21004009]
- Natural Science Foundation of Jiangxi Province [20114BAB213010]
- Young Scientist Foundation of Jiangxi Province [20133BCB23020]
- Foundation of Jiangxi Educational Committee [GJJ14471, GJJ13447]
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In this study, a facile and effective strategy is proposed to fabricate polyimide (PI)-based nanocomposites containing functionalized graphene oxide (FGO) nanosheets by in-situ polymerization and thermal imidization. Highly dispersed CIGO which was firstly obtained by graphene oxide (GO) functionalized with cyclohexyl isocyanate (CI) exhibited excellent dispersibility and compatibility in polyamic acid (PAA, precursor of PI) matrix via in-situ polymerization. Then the CIGO sheets were partially thermally reduced efficiently to FGO during the thermal imidization process of PAA. The incorporation of FGO sheets significantly affected the macroscopic properties of the PI-based composites. A 56.5% increase in the tensile strength and a 43.8% improvement in the Young's modulus were achieved for 2.0 wt% FGO loading. Furthermore, the thermal stability and glass transition temperature (T-g) were improved by adding FGO. In addition, the hydrophobic behavior of the PI-FGO composite clearly improved because of the excellent hydrophobic properties of FGO. The success of this approach provides a good rational for developing high-performance polymer-based composite materials. (C) 2014 Elsevier B.V. All rights reserved.
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