Study on preparation and electrical properties of modified nano magnesia⁃crosslinked polyethylene composites

doi:10.19491/j.issn.1001-9278.2024.02.004

Abstract

Abstract:

To improve the insulation performance of crosslinked polyethylene （PE⁃XL）， MgO⁃NH₂/PE⁃XL nanocomposites were prepared by using polyethylene （PE） as a matrix and modified MgO （MgO⁃NH₂） as a filler. The electrical insulation performance of the nanocomposites before and after thermal aging was investigated. The obtained results were compared with the unmodified MgO⁃crosslinked polyethylene composites （PE⁃XL/MgO）. The insulation properties of the nanocomposites were studied by DC breakdown strength， space charge， and DC conductivity. Compared to the non⁃aged PE⁃XL/MgO， the non⁃aged PE⁃XL/MgO⁃NH₂ nanocomposites showed an increase in DC breakdown strength by 20 %， and the heterogeneous space charge accumulation could be negligible. After thermal aging， the breakdown strength of MgO /PE⁃XL and PE⁃XL/MgO⁃NH₂ nanocomposites decreased by 38 % and 20 %， respectively， compared to those before thermal aging. In addition， the PE⁃XL/MgO⁃NH₂ nanocomposites obtained from the surface modification of MgO have a lower DC conductivity than PE⁃XL/MgO. The PE⁃XL/MgO⁃NH₂ nanocomposites exhibited better performance under non⁃aging conditions， and they also showed stronger inhibition to the deterioration caused by thermal aging.

Key words: modified nano magnesium oxide, polyethylene, composite material, electrical performance

CLC Number:

TQ325.1⁺2

CHEN Qingjiang, DONG Zhicong, LI Hongfa, WU Yijiang, GAO Song, NIE Wenxiang, LUO Yingwen. Study on preparation and electrical properties of modified nano magnesia⁃crosslinked polyethylene composites[J]. China Plastics, 2024, 38(2): 20-25.

Figures/Tables 10

Fig.1. SEM images of PE⁃XL/MgO and PE⁃XL/MgO⁃NH2 nanocomposites

Fig.2. FTIR spectra of （a）MgO， MgO⁃NH2，（b）PE⁃XL/MgO and PE⁃XL/MgO⁃NH2 nanocomposites before and after aging

复合材料	热老化前	热老化后
PE⁃XL/MgO	1.26	1.72
PE⁃XL/MgO⁃NH₂	1.01	1.02

Tab.1. Carbonyl index of PE⁃XL/MgO and PE⁃XL/MgO⁃NH2 nanocomposites before and after aging

Fig.3. DSC melting curves of PE⁃XL/MgO and PE⁃XL/MgO⁃NH2 nanocomposites before and after aging

复合材料	热老化前	热老化后
PE⁃XL/MgO	44.3	31.7
PE⁃XL/MgO⁃NH₂	55.2	50.8

Tab.2. Crystallinity of PE⁃XL/MgO and PE⁃XL/MgO⁃NH2 nanocomposites before and after aging

Fig.4. Weibull distribution of DC breakdown field strength of PE⁃XL/MgO and PE⁃XL/MgO⁃NH2 nanocomposites before and after aging

样品	形状参数/ kV·mm^-1	直流击穿强度/ kV·mm^-1
热老化前PE⁃XL/MgO	14.821	146.2
热老化后PE⁃XL/MgO	17.253	197.6
热老化前PE⁃XL/MgO⁃NH₂	13.901	101.0
热老化后PE⁃XL/MgO⁃NH₂	15.346	157.4

Tab.3. Weibull parameters of DC breakdown strength of PE⁃XL/MgO and PE⁃XL/MgO⁃NH2 nanocomposites before and after thermal aging

Fig.5. Space charge distribution inside （a） unaged PE⁃XL/MgO，（b） heat⁃aged PE⁃XL/MgO，（c） unaged PE⁃XL/MgO⁃NH2 nanocomposites，（d） heat⁃aged PE⁃XL/MgO⁃NH2 nanocomposites at 50 kV/mm

复合材料	阈值场强/kV·mm^-1		电场畸变/%
复合材料	热老化前	热老化后	热老化前	热老化后
PE⁃XL/MgO	15.3	9.7	26	68
PE⁃XL/MgO⁃NH₂	20.1	18.8	4	8

Tab.4. Parameters calculated from space charge measurements

电场/kV·mm^-1	MgO/PE⁃XL热老化前	MgO/PE⁃XL热老化后	PE⁃XL/MgO⁃NH₂热老化前	PE⁃XL/MgO⁃NH₂热老化后
30	3.2×10^-14	1.1×10^-13	2.4×10^-15	1.2×10^-14
50	1.2×10^-13	1.0×10^-12	5.5×10^-15	6.7×10^-14
70	1.7×10^-12	7.1×10^-12	2.2×10^-14	1.0×10^-13

Tab.5. Effect of applied electric field on the DC conductivity of MgO/PE⁃XL and PE⁃XL/MgO⁃NH2 nanocomposites before and after aging

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