Effect of <scp>multi‐walled</scp> carbon nanotube localization on toughening mechanism and electrical properties of compatibilized <scp>PP</scp>/<scp>EOC</scp> immiscible blend

Morshedi, Fatemeh; Tarashi, Sara; Nazockdast, Hossein

doi:10.1002/pc.27125

Cited by 12 publications

(13 citation statements)

References 58 publications

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“…In contrast, the elongation at the break of nanocomposites containing larger size ZnO particles was lower. This is because the nanoparticles under the applied stress were subjected to stress concentration, leading to debonding and cavitation at their interface with the matrix, consuming abundant energy and thus producing a toughening effect 20 . The number of cavities increased with the increment in stress.…”

Section: Resultsmentioning

confidence: 99%

“…This is because the nanoparticles under the applied stress were subjected to stress concentration, leading to debonding and cavitation at their interface with the matrix, consuming abundant energy and thus producing a toughening effect. 20 The number of cavities increased with the increment in stress. When the smaller size ZnO particles were more uniformly stressed, the larger size ZnO particles were more likely to act as a microcrack initiation point in the matrix, leading to fractures in the material.…”

Section: Thermal and Mechanical Performancementioning

confidence: 96%

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Effect of zinc oxide nanoparticle size on the dielectric properties of polypropylene‐based nanocomposites

Gao

Yao

et al. 2023

Polymer Engineering & Sci

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To develop new environmentally friendly and recyclable high‐voltage cable insulation materials, the effects of the particle size of zinc oxide (ZnO) on the mechanical and electrical properties of nanocomposites were investigated based on a feasibility study of polypropylene (PP) as a high‐performance cable insulation material. The small particle size of ZnO can synergistically toughen PP with a polyolefin elastomer (POE), but the large particle size of ZnO leads to lower elongation at break. Adding ZnO nanoparticles can improve the bulk resistivity of the composites and suppress space charge injection. 0.5ZnO200 has the highest direct current and alternating current breakdown field strengths, 36.6% and 14.7% higher than PP/POE, respectively. This improvement may be due to the ability of 200 nm ZnO to introduce more deep traps. However, as the nanoparticle content rises and the particle size decreases, the agglomeration becomes more frequent, leading to the overlap of inter‐nano interfaces and reducing the modification effect of the nanoparticles. This study on the effect law of nano‐ZnO with different particle sizes on the microstructure, mechanical properties, and electrical properties of PP can provide a reference for developing new recyclable high‐voltage insulated cable materials.

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Section: Resultsmentioning

confidence: 99%

Section: Thermal and Mechanical Performancementioning

confidence: 96%

Effect of zinc oxide nanoparticle size on the dielectric properties of polypropylene‐based nanocomposites

Gao

Yao

et al. 2023

Polymer Engineering & Sci

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“…The interfacial energy between the phases in the blends can be obtained by calculating the surface energy obtained from Equations ( 3) and ( 4), and the ω a is obtained using Equation (2), and the results are listed in Table 4. The ω a > 1 calculated according to Equation (2) indicates that the LDH particles are selectively localized in the EVA elastomer phase during the melt blending process from the thermodynamic aspect. However, the actual distribution needs to be further explored based on the SEM observations.…”

Section: Theoretical Evaluation Of Wetting Coefficient (ω a )mentioning

confidence: 99%

“…[ 1 ] However, the notch sensitivity and poor low‐temperature brittleness of PP make it difficult to be applied alone as one kind of functional materials with increasing performance requirements. [ 2,3 ] Especially, the freezing of PP molecular chains and the concentration of internal stresses lead to defective cracks in low‐temperature environments. Therefore, the investigation on mechanical toughening of PP is imminent to enhance its usefulness for expanding its applications.…”

Section: Introductionmentioning

confidence: 99%

Effect of selectively localized layered double hydroxide (LDH) nanosheet on microstructure, toughness, rheological, and crystallization behaviors of PP/EVA/LDH ternary composites

et al. 2023

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Polypropylene/ethylene vinyl acetate copolymer/layered double hydroxide (PP/EVA/LDH) ternary composites are fabricated by three different processing methods (Methods I, II, and III). The phase morphology distribution, mechanical toughness, rheological, and crystallization behaviors of PP/EVA/LDH ternary composites are investigated by scanning electron microscopy (SEM), Izod impact test, rheology, differential scanning calorimeter (DSC), and polarizing optical microscope. The theoretical calculation results of the wetting coefficient (ωa) show that LDH nanosheets are preferentially localized in the EVA phase. The cross‐sectional results combined with SEM show that the dispersion and phase morphology distribution of LDH are closely related to the kinetic parameter of the blending sequences. The possible phase distribution mechanism is elucidated accordingly. The II‐6c sample has a highest impact strength (4.8 kJ/m2) under the method II compared with that of PP (2.8 kJ/m2) and PP/EVA (4.1 kJ/m2), which shows a more excellent toughening effect due to the synergy of elasticity of EVA and localization of LDH. The DSC results show III‐6e sample has a highest crystallinity (61.8%) because of more well‐dispersed LDH localized in PP matrix phase, providing more crystallization nucleation sites under method III.

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“…Therefore, although thermodynamics is a necessary factor in determining nano-localization, kinetic factors can also practically influence the final localization of nanoparticles. 29 As rheology is a powerful tool for identifying nanocomposite blends' microstructure, frequency sweep tests at small strain amplitudes are used to investigate the linear viscoelastic response. Figure 5 shows the rheological frequency sweep measurements for the neat samples, as well as their nanocomposites containing 1, 3, and 5 phr nanoclay.…”

Section: Localization Of Nanoclay In the Blend Nanocompositesmentioning

confidence: 99%

Toward understanding the crystallization behavior of polypropylene‐based nanocomposites: Effect of ethylene–octene copolymer and nanoclay localization

et al. 2023

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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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Effect of multi‐walled carbon nanotube localization on toughening mechanism and electrical properties of compatibilized PP/EOC immiscible blend

Cited by 12 publications

References 58 publications

Effect of zinc oxide nanoparticle size on the dielectric properties of polypropylene‐based nanocomposites

Effect of zinc oxide nanoparticle size on the dielectric properties of polypropylene‐based nanocomposites

Effect of selectively localized layered double hydroxide (LDH) nanosheet on microstructure, toughness, rheological, and crystallization behaviors of PP/EVA/LDH ternary composites

Toward understanding the crystallization behavior of polypropylene‐based nanocomposites: Effect of ethylene–octene copolymer and nanoclay localization

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