Jamming carbonaceous nanofiller in the continuous phase and at the blend interface for phenomenal improvement in the overall physico-mechanical properties of compatibilized thermoplastic elastomer
“…As a sign of it, at low frequency, the time was long sufficient to unravel the tangles so a huge aggregate of relaxation happened, therefore the physical interaction between the CNT and the polymer matrix was improved, signifying the rheological performance of the material to transition from liquid-like to solid-like, which was accountable for the development in mechanical properties. 41 Figure 5.Storage and loss modulus of WPE/WEPDM filled with different concentrations of CNT and exposed to various gamma dosese.Figure 6.Tan delta of (a) WPE/WEPDM strengthened with different CNT concentrations, (b) WPE/WEPDM/0.5% CNT irradiated at 50 and 100 kGy.…”
Section: Resultsmentioning
confidence: 99%
“…As a sign of it, at low frequency, the time was long sufficient to unravel the tangles so a huge aggregate of relaxation happened, therefore the physical interaction between the CNT and the polymer matrix was improved, signifying the rheological performance of the material to transition from liquid-like to solid-like, which was accountable for the development in mechanical properties. 41 It is obvious that as the temperature increases, the WPE/WEPDM/CNT nanocomposites display only a reduction in the storage modulus. The decrease in storage modulus is apportioned to the relaxation of the polymer chains at the glass transition area.…”
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 radiation on the Nano polymers structure. FTIR and XRD were used to track the structure and crystallinity changes of thermoplastic elastomer with CNT filling. Mechanical features including tensile strength (TS), elongation at break (E%), modulus of elasticity (EM) and hardness (Shore D) of the unirradiated and irradiated samples were evaluated. Furthermore, the dynamic mechanical properties named storage (E′) and loss modulus as well as tan delta (δ) of the fabricated specimens were measured. TGA and also DSC monitored the thermal decomposition and the melting point alterations caused by CNT reinforcement. Electromagnetic Interference (EMI) was studied for all fabricated samples as an application of shielding for radio frequency signals. In general, all the studied parameters revealed improvements of thermoplastic elastomer properties via CNT interference. Subsequent reinforcement of CNT concentrations into WPE/WEPDM produced higher shielding for radio frequency signals. Furthermore, applied gamma radiation doses improved the shielding properties of the fabricated nanocomposites.
“…As a sign of it, at low frequency, the time was long sufficient to unravel the tangles so a huge aggregate of relaxation happened, therefore the physical interaction between the CNT and the polymer matrix was improved, signifying the rheological performance of the material to transition from liquid-like to solid-like, which was accountable for the development in mechanical properties. 41 Figure 5.Storage and loss modulus of WPE/WEPDM filled with different concentrations of CNT and exposed to various gamma dosese.Figure 6.Tan delta of (a) WPE/WEPDM strengthened with different CNT concentrations, (b) WPE/WEPDM/0.5% CNT irradiated at 50 and 100 kGy.…”
Section: Resultsmentioning
confidence: 99%
“…As a sign of it, at low frequency, the time was long sufficient to unravel the tangles so a huge aggregate of relaxation happened, therefore the physical interaction between the CNT and the polymer matrix was improved, signifying the rheological performance of the material to transition from liquid-like to solid-like, which was accountable for the development in mechanical properties. 41 It is obvious that as the temperature increases, the WPE/WEPDM/CNT nanocomposites display only a reduction in the storage modulus. The decrease in storage modulus is apportioned to the relaxation of the polymer chains at the glass transition area.…”
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 radiation on the Nano polymers structure. FTIR and XRD were used to track the structure and crystallinity changes of thermoplastic elastomer with CNT filling. Mechanical features including tensile strength (TS), elongation at break (E%), modulus of elasticity (EM) and hardness (Shore D) of the unirradiated and irradiated samples were evaluated. Furthermore, the dynamic mechanical properties named storage (E′) and loss modulus as well as tan delta (δ) of the fabricated specimens were measured. TGA and also DSC monitored the thermal decomposition and the melting point alterations caused by CNT reinforcement. Electromagnetic Interference (EMI) was studied for all fabricated samples as an application of shielding for radio frequency signals. In general, all the studied parameters revealed improvements of thermoplastic elastomer properties via CNT interference. Subsequent reinforcement of CNT concentrations into WPE/WEPDM produced higher shielding for radio frequency signals. Furthermore, applied gamma radiation doses improved the shielding properties of the fabricated nanocomposites.
“…Table S3 illustrates the values of τ 1/2 and X c for the neat PP and different PP/EOC blends obtained from DSC results at 125 C. The X c parameter is calculated using Equation (2), where the numerator is the apparent crystallization enthalpy of PP and ΔH 100% is the enthalpy corresponding to the melting of 100% crystalline PP, taken as 177 J/g. 44 The results reveal that for the PP phase, the values of τ 1/2 increase with EOC content while X c values show a decreasing trend.…”
“…1 A common practice to address this problem is to blend the PP with an impact modifier, like ethylene propylene diene (EPDM), ethylene propylene rubber (EPR), styrene ethylene butylene styrene triblock copolymer (SEBS), and various polyolefin elastomers (POEs). [2][3][4][5][6][7][8][9] Polyethylene can be copolymerized with different comonomers (ethylene α-olefin copolymers) at different copolymerization ratios to come up with a polyolefin elastomer. Ethylene octene copolymer (EOC) has been highly regarded among ethylene α-olefin copolymers derivatives.…”
Section: Introductionmentioning
confidence: 99%
“…Despite its widespread applications, PP suffers from poor impact strength 1 . A common practice to address this problem is to blend the PP with an impact modifier, like ethylene propylene diene (EPDM), ethylene propylene rubber (EPR), styrene ethylene butylene styrene triblock copolymer (SEBS), and various polyolefin elastomers (POEs) 2–9 …”
The crystallization properties of polypropylene (PP), a widely used polymer in industry, can be modified to overcome its mechanical limitations. In the current work, we investigated the effect of ethylene octene copolymer (EOC), blend morphology, nanoclay loading, nano‐localization, and component ratios on PP/EOC crystallization behavior in various aspects, including crystallization rate, degree of crystallinity, nucleation state, and crystalline phases. The results revealed that adding EOC with varying ratios can decrease PP crystallinity both in degree and rate due to the partial miscibility of components through grafting. Furthermore, it was found that the effect of the nanoclay on the crystallization behavior of PP is dependent on the nanoclay loading and its localization in the blend. The nanoclay, therefore, served as a nucleation agent at low nanoparticle contents, accelerating the crystallization rate regardless of the blend's microstructure. However, the crystallization rate of the blend samples at high nanoclay contents (above the rheological percolation threshold) was strongly influenced by the type of morphology. Accordingly, high nanoclay concentrations in blends with matrix‐dispersed morphologies reduced crystallization rates (increasing half‐time from 164 to 216 and 186 s), primarily because PP chains slowed down due to their interactions with nanoparticles and nanoclay hindrance. In contrast, in a blend with a co‐continues‐type morphology, the crystallization rates increased (decreasing half‐time from 624 to 270 and 236 s) due to nano‐localization at the interface and morphology transformation to the matrix‐dispersed one. The blends and nanocomposites based on PP/EOC were also investigated to determine the relationship between the crystallization behavior and mechanical properties.
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