The development of low electrical and thermal properties of Polyamide (PA), which is used in place of metals in engineering applications, draws attention to the developments in various industrial disciplines. In this study, the effects of metal and carbon based fillers on the properties of Polyamide 6,6 (PA 6,6) were investigated. Especially, copper powder (Cu), carbon black (CB), carbon fiber (CF) and hybrid fillers (Cu/CB/CF) reinforced composites based on PA 6,6 were prepared by twin-screw extruder followed by injection molding. In the microstructure investigation, it was observed that the dispersion properties of used fillers were different in the PA 6,6 matrix. Both electrical and thermal conductivity of the PA 6,6 composites prepared were higher than pure PA 6,6. The highest electrical and thermal conductivity values were obtained as 7.97x10−2 S/cm and 0.73 W/mK for PA 6,6/CB30 and PA 6,6/CF/CB/Cu 10, respectively. The effects of the fillers on melting and crystallization behaviors and mechanical properties that affect the performance of PA 6,6 composites are also discussed. In general, the results showed that the mechanical properties of PA 6,6 composites were improved with the increase in the amount of hybrid filler. The highest tensile and notched Charpy impact strength were obtained as 252 MPa and 8.84 kJ/m2 in PA 6,6 composite with 30% carbon fiber reinforcement by volume. As a result, the tensile properties of PA 6,6 hybrid composite were found to be superior to PA 6,6/CF composite with the same amount of carbon fiber content.
In this study, different amounts of aluminum dross (Al‐dross) powders were incorporated into polyoxymethylene (POM) by the melt‐mixing method, and morphological, thermal, rheological, mechanical and dielectric properties of the obtained composite samples were investigated. So, it was aimed to develop value‐added products and create an alternative utilization method for industrial waste that poses environmental risk and does not have a useful application area. The morphological analyses performed by scanning electron microscopy (SEM) showed that the Al‐dross contained various inorganic components with different particle sizes such as Al2O3, NaCl. Moreover, no significant structural incompatibility between the POM and Al‐dross was observed. In contrast, the SEM analyses showed non‐coated filler particle surfaces, which were probably due to the breaking of NaCl particles during the extrusion process. In the differential scanning calorimetry (DSC) analysis, it was found that the effect of Al‐dross addition on the crystallization temperature, amount of crystalline structure in the polymer phase or crystallization rate was limited. The rheological analyses showed that the Al‐dross particles formed rheological percolated structures at an Al‐dross ratio of 20% wt. In the dynamic mechanic analysis (DMA), it was observed that the modulus of elasticity (E') increased by approximately 40% and creep strain decreased by approximately 50% by the addition of Al‐dross into the POM phase at the 40% in %wt. Finally, in the dielectric analyses carried out in the frequency range of 1–14 GHz by a vector network analyzer, it was concluded that incorporating Al‐dross at 40% caused an increase of 1.5 and 3 times in real and imaginary part of the complex permittivity.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.
hi@scite.ai
10624 S. Eastern Ave., Ste. A-614
Henderson, NV 89052, USA
Copyright © 2024 scite LLC. All rights reserved.
Made with 💙 for researchers
Part of the Research Solutions Family.