A facile assembly of polyimide/graphene core–shell structured nanocomposites with both high electrical and thermal conductivities. (May 2016)

• Record Type: Journal Article
• Authors: Xu, Lubo; Chen, Guofei; Wang, Wei; Li, Lan; Fang, Xingzhong
• Is Part Of: Composites. Volume 84(2016)
• Page Start: 472
• Page End: 481
• Publication Date: 2016-05
• Subjects: A. Polymer-matrix composites (PMCs) -- A. Graphene -- E. Assembly -- B. Electrical properties; Composite materials -- Periodicals; Manufacturing processes -- Periodicals; Composite materials; Manufacturing processes; Periodicals; 620.11805
• DOI: 10.1016/j.compositesa.2016.02.027
• Languages: English
• ISSNs: 1359-835X

Abstract

Abstract: Polyimide/reduced graphene oxide (PI/r-GO) core–shell structured microspheres were fabricated by in-situ reduction of graphene oxide (GO), which was coated on the surface of PI microspheres via hydrogen bonding and π–π stacking interaction. The highly ordered 3D core–shell structure of PI/r-GO microspheres with graphene shell thickness of 3 nm was well characterized by scanning electron microscope (SEM), transmission electron microscopy (TEM) and Raman spectra. The glass transition temperature ( T g ) of PI/r-GO microspheres was slightly increased because of the interaction of r-GO and PI matrix while the temperature at 5% weight loss ( T 5% ) of PI/r-GO microspheres was decreased due to the side effect of reductant hydrazine hydrate. The PI/r-GO nanocomposites exhibited highly electrical conductivity with percolation threshold of 0.15 vol% and ultimate conductivity of 1.4 × 10 −2 S/m. Besides, the thermal conductivity of PI/r-GO nanocomposites with 2% weight content of r-GO could reach up to 0.26 W/m K.