石墨烯掺杂聚合物复合材料介电性能建模

doi:10.7527/S1000-6893.2023.29510

Abstract

Abstract:

A dielectric model of graphene-doped polymer composites is proposed based on the interfacial polarization theory， and the effect of graphene on the effective permittivity of the composites is described. The proposed model explains the interaction between graphene nanoplatelets and polymer matrix at the interfacial layer and calculates the local permittivity and the local electric field of the interfacial layer. With the control variable method， the influence of material properties in the dielectric model is analyzed. Compared with the traditional empirical model， the proposed dielectric model clarified the mechanism of the effect of the upper limit separation distance， the potential barrier height， the matrix layer conductivity， the graphene nanoplatelet sizes， and other factors on the effective permittivity. The effective permittivity of multiple binary and ternary dielectric composites is predicted. The validity of the proposed model is verified by comparing with the experimental values of samples and literature.

Key words: graphene, permittivity, interfacial polarization, polymer composite, doping modification

CLC Number:

V257

Ziwei FANG, Jingjing HE, Jing LIN. Modeling study on dielectric properties of graphene⁃doped polymer composites[J]. Acta Aeronautica et Astronautica Sinica, 2024, 45(14): 429510-429510.

Figures/Tables 10

Fig.1

Fig.2

Table 1

Parameters in simulation

参数	取值	参数	数值
$L$ /μm	10.00	$ε m$	100.65
$D$ /μm	1.41	$ε c$	1.80
$r c$ /nm	0.50	$σ m$ /（S·m^-1）	10^-7
$d c$ /nm	10.00	$σ c$ /（S·m^-1）	10⁵
$φ c$ /vol%	0.28	$a$	2 183
$E 0$ /（10⁵ V·m^-1）	1	$λ$ /eV	0.01
$a c$ /μm²	3.12	$φ$ /vol%	0.3

Table 1

Fig.3

Fig.4

Fig.5

Fig.6

Fig.7

Fig.8

Fig.9

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Modeling study on dielectric properties of graphene⁃doped polymer composites

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