Hybrid network structure and thermal conductive properties in poly(vinylidene fluoride) composites based on carbon nanotubes and graphene nanoplatelets
“…The static electricity accumulation of the coated samples were significantly lower than that of the raw material, mainly because the CL-20 crystal was bound by the binder and coating materials to a larger particles, reducing the friction during the contact area, thus reducing the friction accumulated charge [ 23 , 24 ]. What's more, the electrostatic accumulation of CL-20 coated with rGO and CNT’s mixture is mainly affected by the CNT [ 25 ]. Fig.…”
The graphene (rGO) and carbon nanotube (CNT) were adopted to enhance the thermal conductivity of CL-20-based composites as conductive fillers. The microstructure features were characterized using scanning electron microscopy (SEM) and X-ray diffraction (XRD), and tested the properties by differential scanning calorimeter (DSC), static electricity accumulation, special height, thermal conductivity, and detonation velocity. The results showed that the mixture of rGO and CNT had better effect in thermal conductivity than rGO or CNT alone under the same loading (1 wt%) and it formed a three-dimensional heat-conducting network structure to improve the heat property of the system. Besides, the linear fit proved that the thermal conductivity of the CL-20-based composites were negatively correlated with the impact sensitivity, which also explained that the impact sensitivity was significantly reduced after the thermal conductivity increased and the explosive still maintained better energy.Electronic supplementary materialThe online version of this article (10.1186/s11671-018-2496-3) contains supplementary material, which is available to authorized users.
“…The static electricity accumulation of the coated samples were significantly lower than that of the raw material, mainly because the CL-20 crystal was bound by the binder and coating materials to a larger particles, reducing the friction during the contact area, thus reducing the friction accumulated charge [ 23 , 24 ]. What's more, the electrostatic accumulation of CL-20 coated with rGO and CNT’s mixture is mainly affected by the CNT [ 25 ]. Fig.…”
The graphene (rGO) and carbon nanotube (CNT) were adopted to enhance the thermal conductivity of CL-20-based composites as conductive fillers. The microstructure features were characterized using scanning electron microscopy (SEM) and X-ray diffraction (XRD), and tested the properties by differential scanning calorimeter (DSC), static electricity accumulation, special height, thermal conductivity, and detonation velocity. The results showed that the mixture of rGO and CNT had better effect in thermal conductivity than rGO or CNT alone under the same loading (1 wt%) and it formed a three-dimensional heat-conducting network structure to improve the heat property of the system. Besides, the linear fit proved that the thermal conductivity of the CL-20-based composites were negatively correlated with the impact sensitivity, which also explained that the impact sensitivity was significantly reduced after the thermal conductivity increased and the explosive still maintained better energy.Electronic supplementary materialThe online version of this article (10.1186/s11671-018-2496-3) contains supplementary material, which is available to authorized users.
“…Benefiting from their ultrahigh aspect ratio (length over diameter) and thermal conductivity, CNTs have been popularly adopted to form synergistic networks with other fillers, in which the synergistic networks are normally generated through melting and mixing binary or more type of fillers directly with the polymer. The synergistic effect ( f ) can be quantified as , where κ A and κ B are the thermal conductivity of the polymer composite with fillers A and B, respectively; κ p and κ AB are the thermal conductivity of the pristine polymer and the composite with the AB synergistic network, respectively. The effective synergistic network is formed when f is larger than 1, and greater f suggests stronger synergistic effect.…”
Section: Polymer Composites With Nanostructured Fillers For High Thermentioning
confidence: 99%
“…The effective synergistic network is formed when f is larger than 1, and greater f suggests stronger synergistic effect. 2D nanomaterials, such as BN nanosheet (BNNS) and graphene (nanosheet or nanoplatelets), have been commonly used to form the synergistic networks with CNT . For BNNS, its electrical insulation characteristic can interrupt the electrically conductive network of CNTs in the polymer composites, and retain the electrical insulation characteristic of the polymer …”
Section: Polymer Composites With Nanostructured Fillers For High Thermentioning
This work summarizes the recent progress on the thermal transport properties of 3D nanostructures, with an emphasis on experimental results. Depending on the applications, different 3D nanostructures can be prepared or designed to either achieve a low thermal conductivity for thermal insulation or thermoelectric devices or a high thermal conductivity for thermal interface materials used in the continuing miniaturization of electronics. A broad range of 3D nanostructures are discussed, ranging from colloidal crystals/assemblies, array structures, holey structures, hierarchical structures, to 3D nanostructured fillers for metal matrix composites and polymer composites. Different factors that impact the thermal conductivity of these 3D structures are compared and analyzed. This work provides an overall understanding of the thermal transport properties of various 3D nanostructures, which will shed light on the thermal management at nanoscale.
“…The combination of solution casting followed by melt intercalation/pressing has also been reported [28,32,33]. The main was to ensure the interaction between the fillers in order to promote the conductance path network within the host matrix.…”
It is well known that polymers are insulators, which limit their usage in other applications where thermal conductivity is essential for heat to be efficiently dissipated or stored. In the past, the improvement in the thermal conductivity of polym.rs with conductive fillers has been investigated by researchers. Carbon-based materials such as graphite, graphene and carbon nanotube, which feature excellent properties such as a high mechanical strength, a high thermal conductivity and a tailorable electronic configuration, have been added to different polymer matrices to enhance their thermal conductivity. Amongst others, graphite more especially expanded graphite merits special interest because of its abundant availability at a relatively low cost and lightweight when compared to other carbon allotropes. Herein, we describe the thermal conductivity of polymer/graphite composites and their applications.
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