Theoretical study on the radical reaction mechanism in the cross-linking process of polyethylene

Zhang, Hui; Shang, Yan; Li, Mingxia; Zhao, Hong; Wang, Xuan; Han, Baozhong

doi:10.1039/c5ra16339k

Cited by 31 publications

(25 citation statements)

References 24 publications

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“…Table 3 lists the calculated values of the vertical and adiabatic IPs and EAs at the B3LYP/6-311+G(d,p) level and the corresponding experimental data 32 (in bracket), as well as the calculated HOMO-LUMO energy gap (E g ). The B3LYP//6-311+G(d,p) level was conrmed to be suitable for the current study since the computational values of the adiabatic ionization potentials IP(a) and the electron affinities EA(a) at this level are in agreement with the corresponding experimental values in our previous study, 33 which indicates that the theoretical results herein are reasonable and reliable. The varied trends of the IP and EA are similar to that for the negative value of the corresponding HOMO and LUMO energies, respectively.…”

Section: Energies: Frontier Mos Ips and Eassupporting

confidence: 71%

Theoretical study on the reaction of triallyl isocyanurate in the UV radiation cross-linking of polyethylene

et al. 2017

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Section: Energies: Frontier Mos Ips and Eassupporting

confidence: 71%

Theoretical study on the reaction of triallyl isocyanurate in the UV radiation cross-linking of polyethylene

et al. 2017

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“…The transition state was identified by having only one imaginary frequency. This level of B3LYP/6-311+G( d , p ) has been proved to be suitable for current research in our previous paper where the calculated results are consistent with the corresponding experimental results [26]. The time-dependent density functional theory (TDDFT) method [27,28] was employed to calculate the excitation energies of two kinds of polar molecules on the basis of the optimized geometries at the B3LYP/6-311+G( d , p ) level.…”

Section: Methodsmentioning

confidence: 68%

Theoretical Study on the Grafting Reaction of Maleimide to Polyethylene in the UV Radiation Cross-Linking Process

et al. 2018

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Theoretical investigation of the reaction of graft maleimide to polyethylene in the UV radiation cross-linking process is accomplished at the B3LYP/6-311+G(d,p) level for high-voltage cable insulation materials. The reaction potential energy surface of the nine reaction channels is identified. The results show that the N,N′-ethylenedimaleimide can connect two 4-methylheptane molecules and act as the cross-linking agent. The calculated reaction potential barrier of forming 4-methylheptane radical by maleimide is higher than that of maleic anhydride. The study is expected to provide a basis for optimizing the UV radiation cross-linking polyethylene process and development more than 500 kV high-voltage cable insulation materials in practical applications.

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“…This compound effectively inhibited electrical tree initiation and showed improved compatibility with XLPE; however, it did not inhibit the migration of voltage stabilizers. Zhang et al found by theoretical calculation that acetophenone doping in XLPE or grafting onto XLPE molecule chains can suppress electrical tree initiation and propagation and enhance the breakdown strength [28,29]. We propose to address the problem of voltage stabilizer migration by grafting the voltage stabilizer onto XLPE, which to our knowledge has not been previously reported.…”

Section: Introductionmentioning

confidence: 98%

Use of Grafted Voltage Stabilizer to Enhance Dielectric Strength of Cross-Linked Polyethylene

et al. 2019

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Aromatic voltage stabilizers can improve the dielectric properties of cross-linked polyethylene (XLPE); however, their poor compatibility with XLPE hinders their practical application. Improving the compatibility of aromatic voltage stabilizers with XLPE has, therefore, become a new research goal. Herein 1-(4-vinyloxy)phenylethenone (VPE) was prepared and characterized. It can be grafted onto polyethylene molecules during the cross-linking processes to promote stability of the aromatic voltage stabilizers in XLPE. Fourier transform infrared spectroscopy confirmed that VPE was successfully grafted onto XLPE, and effectively inhibited thermal migration. Thermogravimetric analysis showed that the grafted VPE/XLPE composite exhibits a better thermal stability than a VPE/PE blend composite. Evaluation of the electrical properties showed that the breakdown strength and electrical tree initiation voltage of the VPE/XLPE composite were increased by 15.5% and 39.6%, respectively, when compared to those of bare XLPE. After thermal aging, the breakdown strength and electrical tree initiation voltage of the VPE/XLPE composite were increased by 9.4% and 25.8%, respectively, in comparison to those of bare XLPE, which indicates that the grafted voltage stabilizer can effectively inhibit its migration and enhance the stability of the composite material.

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Theoretical study on the radical reaction mechanism in the cross-linking process of polyethylene

Abstract: The mechanism of the valerophenone voltage stabilizer for increasing the electrical breakdown strength of cross-linked polyethylene is expected to provide reliable information to prepare insulation material for high voltage cables up to 500 kV.

Cited by 31 publications

References 24 publications

Theoretical study on the reaction of triallyl isocyanurate in the UV radiation cross-linking of polyethylene

Theoretical study on the reaction of triallyl isocyanurate in the UV radiation cross-linking of polyethylene

Theoretical Study on the Grafting Reaction of Maleimide to Polyethylene in the UV Radiation Cross-Linking Process

Use of Grafted Voltage Stabilizer to Enhance Dielectric Strength of Cross-Linked Polyethylene

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