Three polymers, poly(vinyl alcohol) (PVA), poly(acrylic acid) (PAA) and poly(methyl methacrylate) (PMMA), are used as matrices to synthesize three nanocomposites each with reduced graphene oxide (RGO) fillers (5 wt%). The dielectric properties of these nanocomposites, RGO–PVA, RGO–PAA and RGO–PMMA, are studied in zero magnetic field and in magnetic field ( H ) up to 1.2 T. From these data magnetodielectric effects are obtained as the variation of $$ \varepsilon^{\prime} $$ ε ′ and $$ \varepsilon^{\prime\prime} $$ ε ″ —the real and imaginary parts of complex dielectric constant with H at some frequencies. Thus at 100 kHz for the increase of H from zero to 1 T $$ \varepsilon^{\prime} $$ ε ′ decreases by 5% in RGO–PVA and by 4% in RGO–PAA, whereas $$ \varepsilon^{\prime} $$ ε ′ increases by 4% in RGO–PMMA. The observed magnetodielectric effects, though small, are significant. They show both decrease and increase of $$ \varepsilon^{\prime} $$ ε ′ depending on the polymer. This fact is the indicative of the interaction between RGO filler particles and polymer chains.

中文翻译：

---

三种还原氧化石墨烯-聚合物纳米复合材料的磁介电效应

三种聚合物，聚（乙烯醇）（PVA）、聚（丙烯酸）（PAA）和聚（甲基丙烯酸甲酯）（PMMA），被用作合成三种纳米复合材料的基质，每一种都具有还原氧化石墨烯（RGO）填料（5wt% %）。这些纳米复合材料 RGO-PVA、RGO-PAA 和 RGO-PMMA 的介电特性在零磁场和高达 1.2 T 的磁场 ( H ) 中进行了研究。从这些数据中获得磁介电效应作为 $$ 的变化\varepsilon^{\prime} $$ ε ′ 和 $$ \varepsilon^{\prime\prime} $$ ε ″ - 在某些频率下具有 H 的复介电常数的实部和虚部。因此，在 100 kHz 时，H 从 0 增加到 1 T $$ \varepsilon^{\prime} $$ ε ′ 在 RGO-PVA 中降低 5%，在 RGO-PAA 中降低 4%，而 $$ \varepsilon^ {\prime} $$ ε ′ 在 RGO-PMMA 中增加了 4%。观察到的磁介电效应，虽小，意义重大。它们显示 $$ \varepsilon^{\prime} $$ ε ' 的减少和增加取决于聚合物。这一事实表明了 RGO 填料颗粒和聚合物链之间的相互作用。