Coupling Effect of LDPE Molecular Chain Structure and Additives on the Rheological Behaviors of Cable Insulating Materials

Li, Jiacai; Si, Zhicheng; Shang, Kai; Wu, Yifan; Feng, Yang; Wang, Shihang; Li, Shengtao

doi:10.3390/polym15081883

Open AccessArticle

Coupling Effect of LDPE Molecular Chain Structure and Additives on the Rheological Behaviors of Cable Insulating Materials

by

Jiacai Li

,

Zhicheng Si

,

Kai Shang

,

Yifan Wu

,

Yang Feng

^*,

Shihang Wang

and

Shengtao Li

^*

State Key Laboratory of Electrical Insulation and Power Equipment, Department of Electrical Engineering, Xi’an Jiaotong University, Xi’an 710049, China

^*

Authors to whom correspondence should be addressed.

Polymers 2023, 15(8), 1883; https://doi.org/10.3390/polym15081883

Submission received: 8 March 2023 / Revised: 29 March 2023 / Accepted: 12 April 2023 / Published: 14 April 2023

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Abstract

The rheological behaviors of low-density polyethylene doped with additives (PEDA) determine the dynamic extrusion molding and structure of high-voltage cable insulation. However, the coupling effect of additives and molecular chain structure of LDPE on the rheological behaviors of PEDA is still unclear. Here, for the first time, the rheological behaviors of PEDA under uncross-linked conditions are revealed by experiment and simulation analysis, as well as rheology models. The rheology experiment and molecular simulation results indicate that additives can reduce the shear viscosity of PEDA, but the effect degree of different additives on rheological behaviors is determined by both chemical composition and topological structure. Combined with experiment analysis and the Doi–Edwards model, it demonstrates that the zero-shear viscosity is only determined by LDPE molecular chain structure. Nevertheless, different molecular chain structures of LDPE have different coupling effects with additives on the shear viscosity and non-Newtonian feature. Given this, the rheological behaviors of PEDA are predominant by the molecular chain structure of LDPE and are also affected by additives. This work can provide an important theoretical basis for the optimization and regulation of rheological behaviors of PEDA materials used for high-voltage cable insulation.

Keywords: low-density polyethylene; additives; molecular chain structure; rheological behaviors; cable-insulating materials

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MDPI and ACS Style

Li, J.; Si, Z.; Shang, K.; Wu, Y.; Feng, Y.; Wang, S.; Li, S. Coupling Effect of LDPE Molecular Chain Structure and Additives on the Rheological Behaviors of Cable Insulating Materials. Polymers 2023, 15, 1883. https://doi.org/10.3390/polym15081883

AMA Style

Li J, Si Z, Shang K, Wu Y, Feng Y, Wang S, Li S. Coupling Effect of LDPE Molecular Chain Structure and Additives on the Rheological Behaviors of Cable Insulating Materials. Polymers. 2023; 15(8):1883. https://doi.org/10.3390/polym15081883

Chicago/Turabian Style

Li, Jiacai, Zhicheng Si, Kai Shang, Yifan Wu, Yang Feng, Shihang Wang, and Shengtao Li. 2023. "Coupling Effect of LDPE Molecular Chain Structure and Additives on the Rheological Behaviors of Cable Insulating Materials" Polymers 15, no. 8: 1883. https://doi.org/10.3390/polym15081883

APA Style

Li, J., Si, Z., Shang, K., Wu, Y., Feng, Y., Wang, S., & Li, S. (2023). Coupling Effect of LDPE Molecular Chain Structure and Additives on the Rheological Behaviors of Cable Insulating Materials. Polymers, 15(8), 1883. https://doi.org/10.3390/polym15081883

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Coupling Effect of LDPE Molecular Chain Structure and Additives on the Rheological Behaviors of Cable Insulating Materials

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