Preparation and dielectric properties of polypropylene/ZrO2 composite materials

doi:10.19491/j.issn.1001-9278.2024.03.008

Abstract

Abstract:

The surface modification of zirconium oxide （ZrO₂） powders was performed through emulsion coating to improve their dispersion in the polypropylene （PP） matrix. The dielectric， thermal， and mechanical properties of the modified ZrO₂/PP （PP/g⁃ZrO₂） composites were investigated. The results indicated that the dielectric constant of the PP/g⁃ZrO₂ composites increased to 4.28， and their dielectric loss increased from 0.007 1 to 0.068 at a frequency of 1 kH at a ZrO₂ content of 50 wt%. In addition， the thermal stability of the PP/g⁃ZrO₂ composites was significantly improved， and their tensile strength reached 38.33 MPa at a ZrO₂ content of 20 wt%. Through analyzing the agglomeration state of ZrO₂ in the PP matrix before and after modification， the composites achieved optimal overall performance at a ZrO₂ content of 30 wt%.

Key words: zirconium oxide, polypropylene, dielectric property, thermal stability, composite

CLC Number:

TQ325.1⁺4

GUO Jiang, XU Mengyi, LI Hui, HUANG Xiang, LIN Hao, JIANG Shengbao, CHEN Shang, CHEN Cheng. Preparation and dielectric properties of polypropylene/ZrO₂composite materials[J]. China Plastics, 2024, 38(3): 44-48.

Figures/Tables 9

Fig.1. Sample preparation flow chart

Fig.2. SEM of different PP composite systems

Fig.3. Dielectric properties of PP/ZrO2 composites

Fig.4. Dielectric properties of PP/g⁃ZrO2 composites

Fig.5. DSC results of the samples

样品	质量分数/%	结晶温度/℃	结晶度/%
PP	-	109.3	55.0
PP/ZrO₂	5	114.5	56.3
	10	116.4	56.9
	20	120.1	57.6
	30	118.9	58.2
	40	123.1	58.9
	50	124.7	59.1
PP/g⁃ZrO₂	5	123.0	58.3
	10	124.5	59.0
	20	126.2	60.9
	30	126.4	61.2
	40	127.4	61.7
	50	132.1	62.3

Tab.1. Crystallization temperature and crystallinity of PP/ZrO2 and PP/g⁃ZrO2 composites with different mass fractions

Fig6. XRD of PP，PP/30 %ZrO2 and PP/30 %g⁃ZrO2

Fig.7. TG curves of different composite systems

Fig.8. Tensile strength of PP with different mass fractions of ZrO2

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Preparation and dielectric properties of polypropylene/ZrO₂composite materials

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