Thermophysical properties of cross-linked polyethylene during thermal aging

Liu, Yanxin; Sun, Jianyu; Chen, Shaoping; Sha, Jingjie; Yang, Juekuan

doi:10.1016/j.tca.2022.179231

Cited by 9 publications

(6 citation statements)

References 21 publications

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“…Figure 3d contains the melting range of each sample. Generally, the melting range of polymer is closely correlated with its lattice perfection, the more perfect lattice almost correspond to the narrower melting range 29 . After 2 h of heat aging, due to the high temperature may lead to crystals destruction, the melting range of both FDY and UVFDY became wider (28.4 ± 0.3 and 25.1 ± 0.4°C, respectively).…”

Section: Resultsmentioning

confidence: 98%

“…Generally, the melting range of polymer is closely correlated with its lattice perfection, the more perfect lattice almost correspond to the narrower melting range. 29 After 2 h of heat aging, due to the high temperature may lead to crystals destruction, the melting range of both FDY and UVFDY became wider (28.4 ± 0.3 and 25.1 ± 0.4 C, respectively). However, when the aging time exceeded 2 h, the melting range of UVFDY became wider while that of FDY became narrower, demonstrating that the crosslinked network of UVFDY may lead it difficult to form regular lattice during heat aging.…”

Section: Dsc Analysismentioning

confidence: 96%

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Thermal aging behavior and heat resistance mechanism of ultraviolet crosslinked ultra‐high molecular weight polyethylene fiber

Dong,

Niu,

Qiang

et al. 2024

J of Applied Polymer Sci

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As advances in heat resistant ultrahigh molecular weight polyethylene (UHMWPE) fiber via ultraviolet (UV) crosslinking, it is worth paying attention to its thermal aging behavior and heat resistance mechanism. UHMWPE fibers in different forms, the fully drawn yarn (FDY) and the UV crosslinked FDY (UVFDY), are subjected to isothermal aging at 135°C. The effects of thermal aging on their surface morphology and mechanical properties are studied and compared initially. The results demonstrate that UVFDY is a kind of a heat‐resistant fiber. Subsequently, to reveal the heat resistance mechanism of UVFDY, its crystalline and orientation structure evolution during thermal aging are further studied. It is indicated that the formation of dense‐packing crystals and disorientation behavior lead to fiber shrink, so that a number of grooves appear on the fiber surface. Since the crosslinked stucture of UVFDY hinders its molecules movement, the crystallization and disorientation behavior of UVFDY are weaker than those of FDY, resulting in UVFDY possesses slighter thermal shrinkage (Ts), fewer grooves and better mechanical properties than those of FDY. Therefore, the heat resistance of the fiber improves effectively after UV crosslinking. This work provides insights into the structure–property relationship of UVFDY during thermal aging, and offers basis data for its application in specific conditions.

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Section: Resultsmentioning

confidence: 98%

Section: Dsc Analysismentioning

confidence: 96%

Thermal aging behavior and heat resistance mechanism of ultraviolet crosslinked ultra‐high molecular weight polyethylene fiber

Dong,

Niu,

Qiang

et al. 2024

J of Applied Polymer Sci

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“…The recycled is XLPE foam was used as the core component of the hybrid material. 31,32 The closed-cell structure of XLPE foam traps air inside the material, giving it outstanding thermal insulation capabilities. 33 Its poor heat conductivity means that less heat will move through the material.…”

Section: Methodsmentioning

confidence: 99%

Novel recycling of plastic waste into high impact resistant ultralightweight thermally insulated hybrid composite

Ibrahim,

Bhowmik

2023

Journal of Thermoplastic Composite Materials

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This research discusses the development of a high performance composite out of waste plastic that is ultralightweight, thermally insulated, and high impact resistant. Polycarbonate sheet and Cross-linked Polyethylene (XLPE) foam were combined to create the composite, and silicon adhesive was used to fabricate the composite. Polycarbonate sheets are high impact resistant material, high thermal insulation is provided by XLPE foam, and silicon adhesive is used because of its low thermal conductivity. The composite was fabricated using a stacking technique. The composite prototype was then evaluated by experimenting it to dry ice at a temperature of −78.6°C. Drop tests, compression tests, density measurements was carried out, and thermal analysis was carried out using thermogravimetric analysis. The sample can endure low temperatures while maintaining room temperature on the other side, according to a 24 h dry ice test, whilst a drop test demonstrated that it can withstand significant impact loads. A numerical simulation using Abaqus/Explicit was also used to validate the variations in temperature between the outside surface at −20°C and the inside surface maintained at 30°C of the composites when exposed to cold temperature. The result reveals that the hybrid composite are highly promising in terms of thermal insulation.

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“…Xing等 [21] 将茂金属聚乙烯(metallocene polyethylene, MPE)作为成核剂与 XLPE共混 , 材料共混后的晶体结构更致密, 分子间相互作用更强, 而材料内部自由体积的减小和载流子平均自由程的缩短, 可以减弱高能电子对分子链的损伤, 从而抑制电树枝退化过程. Zhao等 [22] [19] . 联的过程, 如图3(a)所示 [24] .…”

Section: 然而 Xlpe电缆绝缘材料在复杂的工作环境unclassified

Aging and life control of cross-linked polyethylene as cable insulation material

Wang,

Li,

Zhang

et al. 2024

Acta Phys. Sin.

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Cross-linked polyethylene (XLPE) has been widely applied in the field of power cables because of its excellent mechanical properties and insulating properties. However, during the operation of high voltage cables, XLPE will inevitably be affected by electrical aging, thermal aging and electric-thermal joint aging, which makes the performance and life of the material decline. Therefore, it is necessary to enhance the aging resistance of XLPE without affecting its mechanical properties and insulating properties, so as to achieve the purpose of extending its service life. In this paper, the structural characteristics and cross-linking mechanism of XLPE are introduced, the aging process and influencing mechanism are systematically analyzed, and the life decay problems of XLPE due to aging are explored by using methods such as the temperature Arrhenius equation and the inverse power law of voltage. The regulatory strategies such as grafting, blending, and nano-particle modification, etc., can be applied to improve the thermal stability, antioxidant performance, and thermal aging resistance of XLPE, thereby extending its service life. Finally, the future direction of the strategies for regulating the service life of XLPE cable insulation materials is envisioned, which provides theoretical guidance for the further improvement and long-term stable operation of XLPE cable insulation materials.

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Thermophysical properties of cross-linked polyethylene during thermal aging

Cited by 9 publications

References 21 publications

Thermal aging behavior and heat resistance mechanism of ultraviolet crosslinked ultra‐high molecular weight polyethylene fiber

Thermal aging behavior and heat resistance mechanism of ultraviolet crosslinked ultra‐high molecular weight polyethylene fiber

Novel recycling of plastic waste into high impact resistant ultralightweight thermally insulated hybrid composite

Aging and life control of cross-linked polyethylene as cable insulation material

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