Effect of orientation and content of carbon based fillers on thermal conductivity of ethylene‐propylene‐diene/filler composites

Abstract

In this study, synthetic graphite, carbon fiber, and carbon nanotube were used as thermal conductive fillers and ethylene‐propylene‐diene (EPDM) as matrix. Oriented EPDM/filler composites were prepared with two‐roll mill, and the effects of orientation and content of carbon based fillers on thermal conductivity and tensile strength of the composites were investigated. Parallel thermal conductivity of the oriented composites is significantly higher than normal thermal conductivity of the oriented composites. Especially, at 31.6% graphite content, parallel thermal conductivity of oriented composites is 7.14 W/mK. Very high thermal conductivity was achieved for oriented EPDM/graphite composites. Orientation of the fillers using two‐roll mill significantly improves the thermal conductivity in the orientation direction. For all the EPDM/filler composites, tensile strength of orientation direction is higher than that of normal direction. © 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2014, 131, 41000.

Aligned Graphene Oxide Nanofillers: An Approach to Prepare Highly Thermally Conductive and Electrically Insulative Transparent Polymer Composites

“…The pure PVA film has a transmittance greater than 98%. Aligned CNT paper 100% ∼42 [8] Aligned CNT/epoxy composite 50 vol% ∼7 [ 8] Aligned CNT/PVA composite 10 wt% ∼0.5 [10] Aligned graphite/EPDM 31.6 vol% 7.14 [11] Aligned carbon fiber/EPDM 15 vol% 1.23 [11] Aligned CNT/EPDM 15 vol% 1.15 [11] Aligned GR/epoxy 1 vol% ∼0.6 [7] Aligned BNNS/nanofibrillated cellulose The GO/PVA composite at 0.1 wt% GO loading show a transmittance over 92%, while its in-plane thermal conductivity is as high as 17.61 W/mK. When we further increase the filler loadings, the transmittance of the films decreases quickly as predicted.…”

Transport performance in novel elastomer nanocomposites: Mechanism, design and control

“…For example, at a graphite loading of 31.6 vol%, the thermal conductivity of the nanocomposites parallel to the orientation direction was as high as 7.14 W/(m.K), and the observed conductivity anisotropy was approximately 10. This was because the orientation of fillers facilitated them contacting with each other in the orientation direction [237].…”

Anisotropic Nonlinear Mechanical Behavior in Carbon Nanotubes/Poly(1,4-cis-isoprene) Nanocomposites

“…The promotion of highly aligned CNT structures in an elastomeric matrix and the derived effects are topics investigated in the literature. ,,− A high level of CNT alignment has been obtained with several techniques, , such as electrospinning, plasma-enhanced chemical vapor deposition (PECVD), filtration, magnetic field-induced alignment, liquid crystalline phase-induced alignment, and mechanical stretching, but also with common industrial production processes, ,− such as extrusion or injection molding, thanks to the shear deformation occurring in polymer melt flow. CNT orientation may be also altered by the application of strain: in a styrene–butadiene rubber, CNT orientation was observed to decrease after a second stress–strain, and this finding was commented as an indication of weak CNT–polymer interaction …”

“…CNT orientation can influence electrical, ,− thermal, and mechanical , properties of elastomer-based composites. Literature works investigating the anisotropic properties induced by CNT are mostly focused on the increase of properties along the alignment direction of CNT, whereas a proper description of the properties along other directions has mostly been neglected.…”