Study on high-temperature and high-voltage insulation characteristics of polypropylene blend with highly packed elastomeric domains for power cable applications

Kim, Do-Kyun; Lee, Seong Hwan; Kwon, Tae Hoon; Kwon, Ik-Su; Han, Dong Hee; Park, Hoyyul; Han, Se Won; Lee, Dong Hoon; Yu, Seunggun

doi:10.1016/j.polymertesting.2023.107942

Cited by 15 publications

(5 citation statements)

References 31 publications

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“…20 The advantages of this method are functional diversity and strong operability. However, some studies have shown that the materials obtained by this modification method will appear agglomerated caused by phase separation, 21 as well as increased loss due to interfacial polarization under the effect of long-term electrothermal stress, 22 which will further result in the material's insulation degradation. In contrast, intrinsic modification emphasizes the improvement of properties by modulating the polymer matrix material itself, which makes the modified material have more stable physical and chemical properties even under complex working conditions.…”

Section: Introductionmentioning

confidence: 99%

Enhanced Dielectric Breakdown Property of Polypropylene Based on Mesoscopic Structure Modulation by Crystal Phase Transformation for High Voltage Power Cable Insulation

Wu,

Li,

Wang

et al. 2024

ACS Appl. Polym. Mater.

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As an environmentally friendly polymer material, isotactic polypropylene (pp), possesses excellent dielectric properties while it can be recycled, so it is regarded as having promising application prospects in the field of high voltage power cable insulation. However, the increasing operating voltage rating also puts higher demands on its insulation reliability. In this study, an intrinsic modulation method for pp insulation based on mesoscopic structure modulation by crystal phase transformation is proposed, which not only effectively improved the dielectric properties but also enhanced the mechanical toughness synergistically. The transformation of the crystal phase from the α-crystal to β-crystal within the PP/β-NA samples was successfully achieved by the solution blending method. The crystallization efficiency is greatly promoted, and the crystal structure is further improved at the same time. As the proportion of β-crystal gradually increases, the elongation at break could be raised to 451% at maximum. The difference in dielectric parameters between the crystal and amorphous regions is caused by the variation in the molecular chain density and arrangement, which is also the main reason for further triggering the high-intensity partial discharges and large-area electrical tree degradation in the amorphous region between the spherocrystal boundary at the mesoscopic scale. Compared with the premodification, the introduction of β-crystal effectively alleviated the problem of electric field distortion. Among them, the modified PP-β-0.2 sample had 16.8 kV/mm lower maximum electric field, 2258 fewer total partial discharges, 420 μm 2 less electrical tree cumulative damage area, and 28% higher breakdown strength. Accordingly, it also has promising applications in the manufacturing of high-voltage power cable insulation.

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Section: Introductionmentioning

confidence: 99%

Enhanced Dielectric Breakdown Property of Polypropylene Based on Mesoscopic Structure Modulation by Crystal Phase Transformation for High Voltage Power Cable Insulation

Wu,

Li,

Wang

et al. 2024

ACS Appl. Polym. Mater.

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“…[1][2][3] Developing multiphase polymeric systems is commercially important because it allows the combination of properties of different materials or the improvement of the deficiencies of others. 4,5 Polymer blends have gained considerable prominence in the plastics industry. 6,7 These consist of physical mixtures of two or more polymers, regardless of possible chemical bonds between the components.…”

Section: Introductionmentioning

confidence: 99%

Tailoring polyamide 6 to exhibit super‐tough behavior and high thermomechanical stability: The role of AES and EPDM‐MA hybridization

Silva

Luna

Filho

et al. 2023

J of Applied Polymer Sci

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High‐performance blends based on polyamide 6 (PA6) were prepared using a hybrid mixture of acrylonitrile/EPDM/styrene (AES) and maleic anhydride grafted ethylene–propylene–diene (EPDM‐MA). Samples were processed in a twin‐screw extruder and injection molded. The torque curves of the PA6/AES/EPDM‐MA blends shifted to higher torque values with added EPDM‐MA, suggesting a chemical interaction between the components. The melt flow index (MFI) results for the PA6/AES/EPDM‐MA blends confirmed the intensification of the flow resistance. Intense infrared absorption peaks for NH and CO indicated that the amine groups of PA6 reacted with the maleic anhydride in EPDM‐MA. The 60/25/15 wt% PA6/AES/EPDM‐MA blend showed an impact strength over 800 J/m, heat deflection temperature (HDT) of 62.3°C, elongation at break of 115%, and contact angle of 59.1°, corresponding to increases of 1718%, 10.5%, 297%, and 10%, respectively, compared to neat PA6. When examined by scanning electron microscopy, the morphology showed a fracture surface with a high degree of plastic deformation and the formation of elastic microfibrils, contributing to the super toughening of the PA6/AES/EPDM‐MA (15%) system. These results indicate the technological potential of the PA6/AES/EPDM‐MA (15 wt%) blends for application in industrial sectors that require super‐tough plastics.

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“…These radicals 2 of 18 create cross-links and a network structure in the polymer [1]. XLPE is used as an electrical insulating material due to its hydrolysis resistance, high insulation properties, abrasion resistance, and excellent mechanical properties [2][3][4][5][6]. In addition, it is used in piping systems for chemical storage, in heating and cooling systems, etc., due to its high extrusion speed and low cost.…”

Section: Introductionmentioning

confidence: 99%

Chemical Property Evaluation and Tensile Strength Correlation of XLPE Insulators Based on Accelerated Thermal Aging

Kwak,

Jeon,

Kim

et al. 2023

Applied Sciences

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Cross-linked polyethylene (XLPE) cable is a representative power transmission cable. XLPE has excellent mechanical properties, chemical and heat resistance, and insulation. However, XLPE insulation deteriorates during operation due to electrical, mechanical, and thermal stresses. Among these, thermal stress is a major factor and reduces insulation properties due to a change in molecular structure. Therefore, XLPE characteristic evaluation by heat exposure is essential for power cable condition evaluation. Herein, deteriorated XLPE samples were characterized by tensile strength, X-ray diffraction, Fourier-transform infrared spectroscopy, differential scanning calorimetry, and ultraviolet-visible spectroscopy after exposure to various temperatures and durations. Comparing the tensile strength with other analysis results yielded correlations. Each characteristic showed a linear relationship. The correlation between tensile strength and carbonyl index was the strongest, and the coefficient of determination, R2, was 0.9299. Therefore, these results will provide important information on chemical properties when establishing operational management standards for XLPE insulators in the future.

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Study on high-temperature and high-voltage insulation characteristics of polypropylene blend with highly packed elastomeric domains for power cable applications

Cited by 15 publications

References 31 publications

Enhanced Dielectric Breakdown Property of Polypropylene Based on Mesoscopic Structure Modulation by Crystal Phase Transformation for High Voltage Power Cable Insulation

Enhanced Dielectric Breakdown Property of Polypropylene Based on Mesoscopic Structure Modulation by Crystal Phase Transformation for High Voltage Power Cable Insulation

Tailoring polyamide 6 to exhibit super‐tough behavior and high thermomechanical stability: The role of AES and EPDM‐MA hybridization

Chemical Property Evaluation and Tensile Strength Correlation of XLPE Insulators Based on Accelerated Thermal Aging

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