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. 2023 Nov 9;15(22):4363.
doi: 10.3390/polym15224363.

Preparation and Space Charge Properties of Functionalized Zeolite/Crosslinked Polyethylene Composites with High Thermal Conductivity

Bai Han  1   2 , Jinghui Dai  1   2 , Wanliang Zhao  1   2 , Wei Song  1   2 , Zhi Sun  1   2 , Xuan Wang  1   2
Affiliations

Preparation and Space Charge Properties of Functionalized Zeolite/Crosslinked Polyethylene Composites with High Thermal Conductivity

Bai Han et al. Polymers (Basel). .

Abstract

Nanocomposite doping is an effective method to improve the dielectric properties of polyethylene. Meanwhile, the introduction of thermal conductivity groups in crosslinked polyethylene (XLPE) is also an effective way to improve the thermal conductivity. Nano-zeolite is an inorganic material with a porous structure that can be doped into polyethylene to improve the insulation performance. In this paper, hyperbranched polyarylamide (HBP) with a high thermal conductivity and an auxiliary crosslinking agent (TAIC) was grafted on the surface of ZSM-5 nano-zeolite successively to obtain functionalized nano-zeolite (TAICS-ZSM-5-HBP) (the "S" in TAICS means plural). The prepared functionalized nano-zeolite was doped in polyethylene and grafted under a thermal crosslinking reaction to prepare nanocomposites (XLPE/TAICS-ZSM-5-HBP). The structural characterization showed that the nanocomposite was successfully prepared and that the nanoparticles were uniformly dispersed in the polyethylene matrix. The space charge of the TAICS-ZSM-5-HBP 5wt% nanocomposite under a high electric field was obviously inhibited. The space charge short-circuit test showed that the porous structure of the nano-zeolite introduced more deep traps, which made the trapped charge difficult to break off, hindering the charge injection. The introduction of TAICS-ZSM-5-HBP particles can greatly improve the thermal conductivity of nanocomposites. The thermal conductivity of the XLPE/5wt% and XLPE/7wt% TAICS-ZSM-5-HBP nanocomposites increased by 42.21% and 69.59% compared to that of XLPE at 20 °C, and by 34.27% and 62.83% at 80 °C.

Keywords: crosslinked polyethylene; dielectric properties; space charge; thermal conductivity; zeolite.

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Conflict of interest statement

The authors declare no conflict of interest.

Figures

Figure 1
Figure 1
Schematic diagram of the preparation of ZSM-5-HBP.
Figure 2
Figure 2
Schematic diagram of the preparation of TAICS-ZSM-5-HBP.
Figure 3
Figure 3
Installation diagram of space charge test system.
Figure 4
Figure 4
SEM images of XLPE and nanocomposite materials: (a) XLPE, (b) XLPE/5wt%/ZSM-5, (c) XLPE/5wt% TAICS-ZSM-5-HBP, and (d) XLPE/7wt%-TAICS-ZSM-5-HBP.
Figure 5
Figure 5
Infrared spectra of ZSM-5, ZSM-5-HBP, TAICS, and TAICS-ZSM-5-HBP.
Figure 6
Figure 6
Space charge distribution of XLPE and its composite during pressurization at 25 °C.
Figure 7
Figure 7
Space charge distribution of XLPE and its composite during pressurization at 80 °C.
Figure 8
Figure 8
Space charge distribution of XLPE and composites during short circuit at 25 °C.
Figure 9
Figure 9
Space charge distribution of XLPE and composites during short circuit at 80 °C.
Figure 10
Figure 10
Relationship between thermal conductivity and temperature of XLPE and its zeolite composites.
See this image and copyright information in PMC

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