Abstract:Carbon nanotubes (CNTs) have established wide attention as strengthened fillers because of their excellent several characters. Nano polymers based on thermoplastic elastomer composed of waste polyethylene (WPE)/Waste ethylene propylene diene monomer (WEPDM) blended equally 50/50 wt. % and strengthened with different concentrations of CNT (0.1, 0.3, and 0.5%) were fabricated via melt mixing. The prepared specimens were exposed to various gamma radiation doses, namely 50 and 100 kGy to evaluate the impact of rad… Show more
“…6 A). This phenomenon is credited to the uniform distribution of additive nanoparticles 37 , 38 . Controlling the concentration of distributed fillers is established on the reduction in strength property of materials at concentrations above the stated upper threshold values.…”
In the current work, cuprous oxide (Cu2O) nanoparticles coated with Tween 80 were successfully synthesized via the chemical reduction method. Nanocomposites composed of low-density polyethylene (LDPE) and different ratios of Cu2O nanoparticles were fabricated by the melt mixing process. 10% of ethyl vinyl acetate (EVA) as a compatibilizing agent was added to the molten LDPE matrix and the mixing process continued until homogenous nanocomposites were fabricated. To study the influence of ionizing radiation on the fabricated samples, the prepared species were exposed to 50 and 100 kGy of gamma rays. The synthesized Cu2O nanoparticles were investigated by transmission electron microscopy (TEM) and X-ray diffraction (XRD). XRD and TEM analysis illustrated the successful formation of spherical Cu2O nanoparticles with an average size of 16.8 nm. The as-prepared LDPE/Cu2O nanocomposites were characterized via different techniques such as mechanical, thermal, morphological, XRD, and FTIR. Electromagnetic interference shielding (EMI) of the different nanocomposite formulations was performed as a promising application for these materials in practical life. The electromagnetic shielding effectiveness (SE) of the produced samples was measured in the X-band of the radio frequency range from 8 to 12 GHz using the vector network analyzer (VNA) and a proper waveguide. All the samples were studied before and after gamma-ray irradiation under the same conditions of pressure and temperature. The shielding effectiveness increased significantly from 25 dB for unirradiated samples to 35 dB with samples irradiated with 100 kGy, which reflects 40% enhancement in the effectiveness of the shielding.
“…6 A). This phenomenon is credited to the uniform distribution of additive nanoparticles 37 , 38 . Controlling the concentration of distributed fillers is established on the reduction in strength property of materials at concentrations above the stated upper threshold values.…”
In the current work, cuprous oxide (Cu2O) nanoparticles coated with Tween 80 were successfully synthesized via the chemical reduction method. Nanocomposites composed of low-density polyethylene (LDPE) and different ratios of Cu2O nanoparticles were fabricated by the melt mixing process. 10% of ethyl vinyl acetate (EVA) as a compatibilizing agent was added to the molten LDPE matrix and the mixing process continued until homogenous nanocomposites were fabricated. To study the influence of ionizing radiation on the fabricated samples, the prepared species were exposed to 50 and 100 kGy of gamma rays. The synthesized Cu2O nanoparticles were investigated by transmission electron microscopy (TEM) and X-ray diffraction (XRD). XRD and TEM analysis illustrated the successful formation of spherical Cu2O nanoparticles with an average size of 16.8 nm. The as-prepared LDPE/Cu2O nanocomposites were characterized via different techniques such as mechanical, thermal, morphological, XRD, and FTIR. Electromagnetic interference shielding (EMI) of the different nanocomposite formulations was performed as a promising application for these materials in practical life. The electromagnetic shielding effectiveness (SE) of the produced samples was measured in the X-band of the radio frequency range from 8 to 12 GHz using the vector network analyzer (VNA) and a proper waveguide. All the samples were studied before and after gamma-ray irradiation under the same conditions of pressure and temperature. The shielding effectiveness increased significantly from 25 dB for unirradiated samples to 35 dB with samples irradiated with 100 kGy, which reflects 40% enhancement in the effectiveness of the shielding.
“…Wherein the induced vulcanization caused by irradiation results in an increase in the melting temperature because the crystallization process moves more quickly and produces smaller crystals. 5 Figure 9.DSC analysis of HDPE/3K/4G exposed to various gamma radiation doses.…”
Section: Resultsmentioning
confidence: 99%
“…Incorporating an inorganic reinforcing agent into this engineering material might increase its quality and have a substantial financial influence on expanding the applications for PE. [1][2][3][4][5][6] Along with the development of nanomaterials, new products like nanocomposites have received attention. Many investigations have considered the utilization of polymer-based nanocomposites, among different types of nanocomposites, because of their wide area of use, and simpler, and less costly, production methods.…”
In this article, the effect of irradiation dose and incorporated nanoparticles of kaolin (K) and graphite (G) on the lattice structure, thermal analysis, electrical conductivity, morphology, and mechanical properties of high-density polyethylene (HDPE) were studied. Infrared spectroscopy analysis (FTIR), transmission electron microscopy (TEM), and X-ray diffraction (XRD) were used to characterize and prove the nanostructure of kaolin and graphite. Subsequently, HDPE was reinforced with a fixed percentage of nanokaolin at 3 phr and different contents of nanographite at 2 and 4 phr via melt-mixing and then molded by the hot press to sheets of suitable thickness. The fabricated sheets will be exposed to various gamma radiation doses at 50, 100, and 150kGy to investigate the impact of ionizing radiation on the prepared nanocomposites. It was found that the presence of a fixed percent of nanokaolin and graphite nanoparticles at 2 phr inside the HDPE matrix improved various properties of the prepared nanocomposites. Furthermore, the synergistic effect of nanokaolin with nanographite and irradiation doses led to the improved crystal structure, thermal analysis, mechanical properties, and electrical conductivity of HDPE nanocomposites.
“…1,3 The toughness and modulus values of PS20SIBS-CNT nanocomposites were found to be greater than those of PS20SIBS blend (Table 3). This may be ascribed to the presence of CNT 23,24 and decreased dimension of SIBS elastomer domains (Figure 2), 21 respectively as compared to the blend material. A large decrease in toughness value was observed when 10 phr CNT was used (Table 3) which may be due to the transformation of the elastomer phase into a more rigid phase with the use of a high amount of CNT and formation of possible CNT agglomerates.…”
Section: Tensile and Impact Strength Propertiesmentioning
In this study, high impact polystyrene (HIPS) materials was prepared by using a styrenic elastomer (10, 20, 30 wt%) and carbon nanotube (CNT) (3, 5, 7, 10 phr) by melt blending technique as alternative to commercial HIPS including polybutadiene rubber. The poly (styrene- b-isobutylene- b-styrene) (SIBS) was used as thermoplastic elastomer with polystyrene (PS) to improve its poor impact resistance and CNT was added to PS/SIBS blend matrix to maintain its strength and stiffness. The modulus, tensile strength and toughness values of the blends decreased while those of impact resistance increased in comparison to neat PS. The impact strength of PS20SIBS blend containing 20 wt% SIBS was found to be approximately 530% higher than pure PS. The nanocomposites of the PS20SIBS exhibited a decrease in the size of SIBS particles with increasing CNT compared to PS20SIBS. This was ascribed to the increased viscosity of PS matrix via CNT filler, preventing the coalescence of the elastomer domains. Compared to the PS20SIS, its nanocomposites showed higher strength, modulus and toughness, but lower impact strength. The toughness of the nanocomposite containing 5 phr CNT (PS20SIBS-5CNT), increased by 117% while its creep deformation decreased by approximately 40%, in comparison with PS20SIBS blend. Although PS20SIBS-5CNT exhibited lower impact strength than the PS20SIBS blend due to the dispersion of smaller SIBS particles in the PS matrix, it still increased the impact strength of pure PS by 188%. The PS20SIBS-5CNT nanocomposite, which improved impact strength and creep resistance with optimal toughness and tensile modulus can be used as a novel HIPS material that tunes the hardness-toughness/impact balance effectively. Moreover, the same nanocomposite was found to reach the conductivity threshold by exhibiting 106 times lower electrical resistance in comparison with that containing 3 phr CNT, leading to a conductive filer network with 5 phr loading of the nanotubes into the system.
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