固体聚合物片材(HDPE和LDPE)在音频范围内的电性能研究

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摘要

采用两组不同的固体聚合物片材:厚度分别为0.006 cm和0.007 cm的低密度聚乙烯(LDPE)样品和厚度分别为0.009 cm和0.010 cm的高密度聚乙烯(HDPE)样品。用介质电池测量了LDPE和HDPE聚合物片材的介电常数ε′和介电损耗ε′等电性能。电介质电池由两个直径为5厘米,厚度为2毫米的纯不锈钢圆形平行板组成。阻抗桥(GRA 650A)用于测量100 Hz至10 kHz音频(AF)范围内的电容C和耗散因子D。在电池的两个极板之间加载不同的样品,并根据电桥的表盘读数估计电容和耗散系数。讨论了频率变化对音频范围内ε′、ε′′、弛豫时间、τ、耗散因子、tanδ和交流电导率σ的影响。计算了交变场中自由偶极子振荡的复介电常数ε*和损耗正切tanδ。本文研究了LDPE和HDPE的实数部分(M′)和虚数部分(M′)与频率相关的电导率、介电行为和电模量。在低频时,电模量的实部(M′)不等于零,预计两片电极都可能发生极化。这些发现揭示了局域偶极运动在近程序定域运动中耦合性的增强。电介质介电常数的实部(ε′)和虚部(ε′)以及电模量的实部(M′)和虚部(M′)的分析表明,在Cole-Cole图中观察到弛豫时间的多色散性质。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Investigation on Electrical Properties of Solid Polymer Sheets (HDPE AND LDPE) at Audio Frequency Range
Two different groups of solid polymer sheets: low density polyethylene (LDPE) sample of thickness 0.006 cm and 0.007 cm along with high density polyethylene (HDPE) sample of the thickness of 0.009 cm, 0.010 cm were taken in this work. The measurement of electrical properties such as dielectric constant, ε' and dielectric loss, ε'' for LDPE and HDPE polymer sheets have been measured using a dielectric cell. The dielectric cell has been fabricated which consists of two circular parallel plates of pure stainless steel each of 5 cm diameter and 2 mm thickness. An impedance bridge (GRA 650A) was used for measurement of capacitance, C, and dissipation factor, D in the audio frequency (AF) range, 100 Hz to 10 kHz. Different samples were loaded in between the two plates of the cell and the capacitance as well as the dissipation factor were estimated from the dial readings of the bridge. Effect of frequency variation on ε', ε'', relaxation time, τ , dissipation factor, tanδ and ac conductivity, σ were also discussed at audio frequency range. The complex permittivity, ε*, related to free dipole oscillating in an alternating field and loss tangent, tanδ were calculated. The frequency-dependent conductivity, dielectric behavior, and electrical modulus, both real (M') and imaginary (M") parts of LDPE and HDPE have been studied in this work. The values of the real part of the electrical modulus (M') did not equal to zero at low frequencies and it is expected that the electrode polarization may develop in both sheets. These findings reveal an increased coupling among the local dipolar motions in a short-range order localized motion. The analysis of real (ε') and imaginary (ε'') parts of dielectric permittivity and that electrical modulus real (M') and imaginary (M") parts signify poly dispersive nature of relaxation time as observed in Cole-Cole plots.
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