Impact of Graphite on Thermomechanical, Mechanical, Thermal, Electrical Properties, and Thermal Conductivity of HDPE/Copper Composites

Abstract

Impact of graphite on the physicochemical properties of high density polyethylene (HDPE)/copper composites has been investigated at various volume percentages of copper. The two sets of composites are prepared by simple melt blending and injection molding approach. Thermal conductivity increases from 0.5 W m -1 K -1 for pure HDPE to 6.5 and 8 Wm -1 K -1 for 30 and 40 vol.% of copper loading with and without graphite, respectively. A huge increment in synergistic efficiency has been evidenced for the mixed filled polymer composites. Incorporation of graphite has also improved the percolation threshold from 19 to 13 vol.% of copper loading to the HDPE matrix, which indicates the synergistic effect of mixed filler system. Development of leafy morphology of copper promotes large number of inter-particle contacts and hence improves the percolation threshold of the composites. The corrosion resistive, mechanically robust, electrically and thermally conductive composites with good flexural properties and light in weight than conventional metallic bipolar plates suggest it a material of choice for fuel cell devices.

Multifunctional Sulfonated Polytriazoles: Proton-Exchange Membrane Properties, Molecular Logic Gates, and Modeling of Stimuli-Responsive Behaviors

“…The increase of E ′ values up to 140 °C was noticed for the elimination of trapped solvents and antiplasticization effect . Later, a gradual decrease of E′ values from 150 to 260 °C was observed for all the membranes, indicating the transformation from elastic to viscous state . The modulus values (Figure S10a) decreased from 7.9 to 4.4 GPa with the increase in DS values because of the plasticization effect of hydrophilic sulfonic acid groups in polymer chains .…”

“…40 Later, a gradual decrease of E′ values from 150 to 260 °C was observed for all the membranes, indicating the transformation from elastic to viscous state. 41 The modulus values (Figure S10a) decreased from 7.9 to 4.4 GPa with the increase in DS values because of the plasticization effect of hydrophilic sulfonic acid groups in polymer chains. 7 The tan δ versus temperature plot (Figure S10b) highlighted the transitional changes of the loss tangents, where the ionic domains inclined to higher mobility.…”

Epoxy Composites with High Thermal Conductivity by Constructing Three-Dimensional Carbon Fiber/Carbon/Nickel Networks Using an Electroplating Method

“…Due to the low thermal conductivity of polymer packaging materials, the thermal conductivity of the polymer is usually improved by adding high thermal conductivity fillers. The filler-filled thermal conductive polymer materials are mainly prepared by adding high thermally conductive metal materials (such as copper powder, , silver powder, − metal sheet, and wire − ), carbon materials (such as carbon fiber, − graphene, − graphite, − carbon nanotube, − and carbon black − ) or high thermal conductive inorganic fillers (such as aluminum nitride, , boron nitride, − silicon nitride, , silicon carbide, − magnesium oxide, , silicon oxide, alumina, − barium titanate, and zinc oxide) and other high thermal conductivity fillers (such as MXene − ). Filler-filled thermal conductive polymer composites have the advantages of a simple preparation method, low cost, suitable types of polymers, and fillers.…”

Wearable Bipolar Rechargeable Aluminum Battery

“…Bipolar technology changes the traditional serial structure and the current flowing path through the sandwich-like stacking and shared current collectors between adjacent cells, effectively reducing the internal resistance and inactive segments of the package, current collector, and external conductor. It has been long used in conventional rigid batteries to achieve both high energy and power densities. , However, because of the lack of flexible, conductive, and stable bipolar plates and related sealing issues, this bipolar configuration can hardly be applied to flexible batteries. − Recently, diverse bipolar plates of graphite, metal, carbon, and polymer composites have been investigated in fuel cells to enhance the electrical and thermal conductivity, electrochemical stability, and mechanical properties. , Among them, the carbon/polyethylene composite film has been reported to have superior flexibility, heat sealing property, and electrical conductivity, which inspires us to introduce it as bipolar plates for wearable batteries.…”

“…17−19 Recently, diverse bipolar plates of graphite, metal, carbon, and polymer composites have been investigated in fuel cells to enhance the electrical and thermal conductivity, electrochemical stability, and mechanical properties. 20,21 Among them, the carbon/polyethylene composite film has been reported to have superior flexibility, heat sealing property, and electrical conductivity, 22 which inspires us to introduce it as bipolar plates for wearable batteries.…”