Abstract

Samples of poly(methyl methacrylate) (PMMA), poly(vinylidene fluoride) (PVDF) and melt blended PMMA/PVDF with weight ratios 4/1 and 3/2 were characterized by thermally stimulated depolarization currents (TSDC) in the temperature interval 123-303 K and by dielectric relaxation spectroscopy (DRS) in the frequency window 10⁻² − 106 Hz in the temperature interval 153-423 K. The TSDC thermograms and DRS profiles of the samples showed the two types of conducnivity – non-cooperative and cooperative. The experimental DRS data in the vicinity of the glass transition temperature, T_g, were quantitatively fitted to the Havriliak-Negami function and values of the maximum relaxation time were fitted to the Vogel-Tammann-Fulcher equation. Higher values of the strength index D, of the dielectric relaxation strength Δε and of the σ_ac conductivity for the binary blends were considered as experimental evidence for nanoscale composition heterogeneities originating from strong specific interactions between the PMMA and PVDF. Therefore, we suggest the PMMA/PVDF blends will be usefull as effective materials for the manufacture of lithium-ion batteries, electrostatic capacitors with superior energy storage performance, polymer composite electrolytes for solar cells, etc.

抽象的

重量比为4/1和3/2的聚甲基丙烯酸甲酯（PMMA），聚偏二氟乙烯（PVDF）和熔融共混的PMMA / PVDF样品的特征是在温度区间123中受热激发的去极化电流（TSDC） -303 K并通过介电弛豫谱（DRS）在153-423 K的温度区间内的10 ⁻² − 106 Hz频率窗口中。样品的TSDC热谱图和DRS曲线显示出两种类型的电导率–非合作型和非合作型。合作。将玻璃化转变温度T _g附近的实验DRS数据定量拟合至Havriliak-Negami函数，并将最大弛豫时间的值拟合至Vogel-Tammann-Fulcher方程。强度指数较高d，介电弛豫强度Δ的ε和的σ_交流的二元混合物电导率被认为是用于从PMMA和PVDF之间的强的特异性相互作用的纳米级组合物的非均质性始发的实验证据。因此，我们建议将PMMA / PVDF混合物用作制造锂离子电池，具有出色储能性能的静电电容器，太阳能电池用聚合物复合电解质等的有效材料。