Thermal and mechanical properties of copper powder filled poly (ethylene) composites (original) (raw)
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Polymer Degradation and Stability, 2006
Low-density polyethylene (LDPE) and linear low-density polyethylene (LLDPE) with different copper contents were prepared by melt mixing. The copper powder particle distributions were found to be relatively uniform at both low and high copper contents. There was cluster formation of copper particles at higher Cu contents, as well as the formation of percolation paths of copper in the PE matrices. The DSC results show that Cu content has little influence on the melting temperatures of LDPE and LLDPE in these composites. From melting enthalpy results it seems as if copper particles act as nucleating agents, giving rise to increased crystallinities of the polyethylene. The thermal stability of the LDPE filled with Cu powder is better than that for the unfilled polymer. The LLDPE composites show better stability only at lower Cu contents. Generally, the composites show poorer mechanical properties (except Young's modulus) compared to the unfilled polymers. The thermal and electrical conductivities of the composites were higher than that of the pure polyethylene matrix for both the LDPE and LLDPE. From these results the percolation concentration was determined as 18.7 vol.% copper for both polymers.
Journal of Applied Polymer Science, 2017
Synergistic effect of copper and multiwalled carbon nanotube on thermal and mechanical properties of high-density polyethylene (HDPE)-matrix composite was evaluated. Attrition mill was employed to prepare the hybrid powder. Reinforcing the polymer-matrix was carried out using different contents of simultaneously (Sim) and separately (Sep) milled powders as hybrid fillers. X-ray diffraction and microscopy results show different trends of particle size for Sep and Sim affected by both milling time and volume fraction ratio. Thermal characterization indicates that conductivity was enhanced by 90% and thermal expansion was reduced to 53% of neat HDPE. Young's modulus and tensile strength were improved by 7.8 and 1.22 times of neat HDPE, respectively. Also, characteristics of Sim-reinforced composites exhibited better correlated relation with milling time compared with erratic behavior of Sep. V
International Journal of Electrochemical Science, 2018
The results of experimental studies of the properties of composite materials based on poly(methylmetacrylate) (PMMA) matrices filled with electrolytic copper powder, having very high dendritic structure, are presented in this manuscript. Copper powder volume fractions used as filler in all prepared composites were varied in the range of 0.5-8.8 %(v/v). The samples were prepared by hot molding injection at 180°C. Influence of particle size and morphology on the conductivity and percolation threshold and thermal properties of the composites were examined and characterization included: Scanning Electron Microscopy (SEM), Energy-dispersive X-ray spectroscopy (EDS), Thermogravimetric Analysis (TGA), Differential Scanning Calorimetry (DSC), Atomic Forces Microscopy (AFM). Composites have shown improvement of thermal characteristics in relation to pure polymer. Presence of three dimensional conductive pathways was confirmed. The obtained percolation threshold of 2.89 %(v/v) is about three times lower than the one stated in the literature, which is ascribed to different morphology of filler used in investigation.
Thermal and mechanical properties of aluminum powder-filled high-density polyethylene composites
Journal of Applied Polymer Science, 1996
Thermal conductivity and mechanical properties such as tensile strength, elongation at break, and modulus of elasticity of aluminum powder-filled high-density polyethylene composites are investigated experimentally in the range of filler content 0-33% by volume for thermal conductivity and 0-50% by volume for mechanical properties. Experimental results from thermal conductivity measurements show a region of low particle content, 0-12% by volume, where the particles are distributed homogeneously in the polymer matrix and are not interacting with each other; in this region most of the thermal conductivity models for two-phase systems are applicable. At higher particle content, the filler tends to form agglomerates and conductive chains resulting in a rapid increase in thermal conductivity. The model developed by Agari and Uno estimates the thermal conductivity in this region. Tensile strength and elongation at break decreased with increasing aluminum particles content, which is attributed to the introduction of discontinuities in the structure. Modulus of elasticity increased up to around 12% volume content of aluminum particles. Einstein's equation, which assumes perfect adhesion between the filler particles and the matrix, explains the experimental results in this region quite well. For particle content higher than 30%, a decrease in the modulus of elasticity is observed which may be attributed to the formation of cavities around filler particles during stretching in tensile tests. 0 1996 John
International Journal of Polymer Science, 2018
Thermal and electrical conductivity of unsaturated polyester resin with copper filler composite material are investigated both theoretically and experimentally. In the experiments, polyester matrix is combined with dendrite-shape copper to determine the effects of both filler size and content on thermal and electrical conductivity, respectively. It is observed that the increase in the concentration causes the thermal and electrical conductivity of composite mixture to grow up. It has also been observed that the both thermal and electrical conductivity increase with increasing filler particle size.
Acta Physica Polonica A, 2020
In this paper, mechanical, thermal, electrical, and physical properties of unsaturated polyester resin with dendritic-shaped copper(Cu)-graphite (Gr) fillers were experimentally investigated and correlations were proposed with several theoretical models. On the other hand, the Gr filler is added as a secondary filler to provide synergy and obtain better conductivities. For this purpose, 5 wt% Gr filler was added as a secondary filler while Cu was added with changing weight rates. In each experiment, the basic aim is to determine the effects of both filler size and concentration on the mechanical, thermal, and electrical characterizations of the composite mixture. It is observed that an increase in filler concentration causes an increase in thermal conductivities. On the contrary, the coefficient of thermal expansion and specific heat decrease with increasing filler content. The hybrid filler allows the positive synergistic effect on mechanical performance but restricts conductivity properties. The particle size also causes a minimal linear increase in thermal conductivity. Thermal analysis such as thermogravimetric analysis and differential scanning calorimetry show that the thermal stability increases with the filler concentration. On the other hand, the electrical conductivity increases with increasing filler particle size and concentration. Using this high conductive novel composite mixture as an electrode hard steel parts were engraved in an electric discharge machine. Regarding the experimental-theoretical correlation, the best agreement is achieved with the Maxwell model.
Metal Powder-Filled Polyethylene Composites. V. Thermal Properties
Journal of Thermoplastic Composite Materials, 2001
Thermal properties-such as thermal conductivity, thermal diffusivity, and specific heat-of metal (copper, zinc, iron, and bronze) powder-filled high-density polyethylene composites are investigated experimentally in the range of filler content 0-24% by volume. Experimental results show a region of low particle content, 0-16% by volume, where the particles are distributed homogeneously in the polymer matrix and do not interact with each other. In this region most of the thermal conductivity models for two-phase systems are applicable. At higher particle content, the filler tends to form agglomerates and conductive chains resulting in a rapid increase in thermal conductivity.
Materials, 2021
Thermoplastic composite materials are emerging rapidly due to the flexibility of attaining customized mechanical and melt flow properties. Due to high ductility, toughness, recyclability, and thermal and electrical conductivity, there is ample scope of using copper particles in thermoplastics for 3d printing applications. In the present study, an attempt was made to investigate the Melt Flow Index (MFI), tensile strength, and electrical and thermal conductivity of nylon 6 and ABS (acrylonitrile butadiene styrene) thermoplastics reinforced with copper particles. Thus, the experiments were conducted by adding different-sized copper particles (100 mesh, 200 mesh, and 400 mesh) in variable compositions (0% to 10%) to ABS and nylon 6 matrix. The impact of single, double, and triple particle-sized copper particles on MFI was experimentally investigated followed by FTIR and SEM analysis. Also, the tensile, electrical, and thermal conductivity testing were done on filament made by different...
Polymer Composites, 2016
Jute fiber along with Cu particle dispersed unsaturated polyester composites having different filler (both Jute and Cu were in equal wt%) loading viz. 2, 5, 10, and 15 wt% were fabricated by compression molding technique. In the present investigation, it is observed that with fillers (Jute and Cu) incorporation the microhardness increases and reaches its maximum at 10 wt% of fillers content followed by slight deterioration at 15 wt%. Structural investigation through X-ray diffraction, Fourier transforms infrared spectroscopy, and scanning electron microscopy confirms the presence and dispersion of filler. It is observed that with filler addition the crystallinity (%) of the matrix increases which is obtained from X-ray diffraction pattern. Fourier transform infrared spectroscopy ensured the bonding of fillers with the matrix and detected the presence of moisture. The mechanical testing viz., tensile, flexural, and Izod impact test shows the strength and modulus increase monotonically upto 10 wt% filler addition followed by slight decreases at 15 wt% filler content. The scratch result shows the optimization of strength and toughness of the composites. Thermo-gravimetric analysis and differential thermo-gravimetric analysis showed that the thermal stability, degradation temperature, and residual mass significantly increased with fillers addition. The water absorption test (room temperature and boiling temperature) predict a variation in weight with time.