title: Thermally conductive polyamide 6/carbon filler composites based on a hybrid filler system.
abstract: We explored the use of a hybrid filler consisting of graphite nanoplatelets (GNPs) and single walled carbon nanotubes (SWCNTs) in a polyamide 6 (PA 6) matrix. The composites containing PA 6, powdered GNP, and SWCNT were melt-processed and the effect of filler content in the single filler and hybrid filler systems on the thermal conductivity of the composites was examined. The thermal diffusivities of the composites were measured by the standard laser flash method. Composites containing the hybrid filler system showed enhanced thermal conductivity with values as high as 8.8 W (m · K)-1, which is a 35-fold increase compared to the thermal conductivity of pure PA 6. Thermographic images of heat conduction and heat release behaviors were consistent with the thermal conductivity results, and showed rapid temperature jumps and drops, respectively, for the composites. A composite model based on the Lewis-Nielsen theory was developed to treat GNP and SWCNT as two separate types of fillers. Two approaches, the additive and multiplicative approaches, give rather good quantitative agreement between the predicted values of thermal conductivity and those measured experimentally.
authors.affiliation: Division of Advanced Materials, Korea Research Institute of Chemical Technology, Daejeon 34114, Korea; Department of Polymer Science and Engineering, Kyungpook National University, Daegu 41566, Korea.
authors.forename: Sung Min
authors.initials: SM
authors.lastname: Ha
authors.affiliation: Division of Advanced Materials, Korea Research Institute of Chemical Technology, Daejeon 34114, Korea.
authors.forename: O Hwan
authors.initials: OH
authors.lastname: Kwon
authors.affiliation: Division of Advanced Materials, Korea Research Institute of Chemical Technology, Daejeon 34114, Korea; Department of Chemical Convergence Materials and Nanomaterials Science and Engineering, University of Science and Technology, Daejeon 34113, Korea.
authors.forename: Yu Gyeong
authors.initials: YG
authors.lastname: Oh
authors.affiliation: Division of Advanced Materials, Korea Research Institute of Chemical Technology, Daejeon 34114, Korea; Department of Chemical Convergence Materials and Nanomaterials Science and Engineering, University of Science and Technology, Daejeon 34113, Korea.
authors.forename: Yong Seok
authors.initials: YS
authors.lastname: Kim
authors.affiliation: Division of Advanced Materials, Korea Research Institute of Chemical Technology, Daejeon 34114, Korea.
authors.forename: Sung-Goo
authors.initials: SG
authors.lastname: Lee
authors.affiliation: Division of Advanced Materials, Korea Research Institute of Chemical Technology, Daejeon 34114, Korea; Department of Chemical Convergence Materials and Nanomaterials Science and Engineering, University of Science and Technology, Daejeon 34113, Korea.
authors.forename: Jong Chan
authors.initials: JC
authors.lastname: Won
authors.affiliation: Department of Polymer Science and Engineering, Kyungpook National University, Daegu 41566, Korea.
authors.forename: Kwang Soo
authors.initials: KS
authors.lastname: Cho
authors.affiliation: Division of Advanced Materials, Korea Research Institute of Chemical Technology, Daejeon 34114, Korea; Department of Chemical Convergence Materials and Nanomaterials Science and Engineering, University of Science and Technology, Daejeon 34113, Korea.
authors.forename: Byoung Gak
authors.initials: BG
authors.lastname: Kim
authors.affiliation: Division of Advanced Materials, Korea Research Institute of Chemical Technology, Daejeon 34114, Korea; Department of Chemical Convergence Materials and Nanomaterials Science and Engineering, University of Science and Technology, Daejeon 34113, Korea.
authors.forename: Youngjae
authors.initials: Y
authors.lastname: Yoo
keywords: modeling; polymer composites; thermal conductivity; thermography