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<p>Polymer nanodielectrics of Poly (styrene-co-methyl methacrylate) P(St-co-MMA) and hydrothermally synthesized CeO<sub>2</sub> nanoparticles were prepared by solution casting technique. The effect of crystallinity and free volume of P(St-co-MMA)/CeO<sub>2</sub> polymer nanodielectrics on AC conductivity and dielectric properties is studied. The positron lifetime parameters of P(St-co-MMA)/CeO<sub>2</sub> polymer nanodielectrics viz. o-Ps lifetime (<i>τ</i><sub>3</sub>) and free volume size (<i>V</i><sub><i>f</i></sub>) show higher values for 0.4&#xa0;wt% CeO<sub>2</sub> nanofiller loading. AC conductivity <InlineEquation ID="IEq1"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="10854_2025_14256_Article_IEq1.gif" Format="GIF" Height="20" Rendition="HTML" Resolution="72" Type="Linedraw" Width="36" /> </InlineMediaObject> <EquationSource Format="TEX">\({(\sigma }_{ac})\)</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <msub> <mrow> <mo stretchy="false">(</mo> <mi>σ</mi> </mrow> <mrow> <mi mathvariant="italic">ac</mi> </mrow> </msub> <mrow> <mo stretchy="false">)</mo> </mrow> </mrow> </math></EquationSource> </InlineEquation> and dielectric constant (<InlineEquation ID="IEq2"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="10854_2025_14256_Article_IEq2.gif" Format="GIF" Height="12" Rendition="HTML" Resolution="72" Type="Linedraw" Width="17" /> </InlineMediaObject> <EquationSource Format="TEX">\({\varepsilon }{\prime}\)</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <mi>ε</mi> <mo>′</mo> </mrow> </math></EquationSource> </InlineEquation>) also show higher values for 0.4&#xa0;wt% of CeO<sub>2</sub> nanoparticles loading. The increased value of AC conductivity <InlineEquation ID="IEq3"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="10854_2025_14256_Article_IEq3.gif" Format="GIF" Height="20" Rendition="HTML" Resolution="72" Type="Linedraw" Width="36" /> </InlineMediaObject> <EquationSource Format="TEX">\({(\sigma }_{ac})\)</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <msub> <mrow> <mo stretchy="false">(</mo> <mi>σ</mi> </mrow> <mrow> <mi mathvariant="italic">ac</mi> </mrow> </msub> <mrow> <mo stretchy="false">)</mo> </mrow> </mrow> </math></EquationSource> </InlineEquation> and dielectric constant (<InlineEquation ID="IEq4"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="10854_2025_14256_Article_IEq4.gif" Format="GIF" Height="12" Rendition="HTML" Resolution="72" Type="Linedraw" Width="17" /> </InlineMediaObject> <EquationSource Format="TEX">\({\varepsilon }{\prime}\)</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <mi>ε</mi> <mo>′</mo> </mrow> </math></EquationSource> </InlineEquation>) in the P(St-co-MMA)/CeO<sub>2</sub> polymer nanodielectrics for 0.4&#xa0;wt% of CeO<sub>2</sub> nanoparticles loading is attributed to the increased mobility and ionic polarization of Ce<sup><b>4+</b></sup> and O<sup>2<b>−</b></sup> ions in the interface region. The cyclic voltammetry (CV) and charge–discharge studies were also carried out to assess the electrochemical nature of P(St-co-MMA)/CeO<sub>2</sub> polymer nanodielectrics.</p>

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Positron lifetime, dielectric and electrochemical study of P(St-co-MMA)/CeO2 polymer nanodielectrics

  • 期刊论文

  • 发表日期：

    2025年2月17日

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  • M. Raghavendra,
  • K. Jagadish,
  • S. S. Mahesh,
  • A. M. Madhusudhana,
  • H. B. Ravikumar

摘要

Polymer nanodielectrics of Poly (styrene-co-methyl methacrylate) P(St-co-MMA) and hydrothermally synthesized CeO2 nanoparticles were prepared by solution casting technique. The effect of crystallinity and free volume of P(St-co-MMA)/CeO2 polymer nanodielectrics on AC conductivity and dielectric properties is studied. The positron lifetime parameters of P(St-co-MMA)/CeO2 polymer nanodielectrics viz. o-Ps lifetime (τ3) and free volume size (Vf) show higher values for 0.4 wt% CeO2 nanofiller loading. AC conductivity \({(\sigma }_{ac})\) ( σ ac ) and dielectric constant ( \({\varepsilon }{\prime}\) ε ′ ) also show higher values for 0.4 wt% of CeO2 nanoparticles loading. The increased value of AC conductivity \({(\sigma }_{ac})\) ( σ ac ) and dielectric constant ( \({\varepsilon }{\prime}\) ε ′ ) in the P(St-co-MMA)/CeO2 polymer nanodielectrics for 0.4 wt% of CeO2 nanoparticles loading is attributed to the increased mobility and ionic polarization of Ce4+ and O2− ions in the interface region. The cyclic voltammetry (CV) and charge–discharge studies were also carried out to assess the electrochemical nature of P(St-co-MMA)/CeO2 polymer nanodielectrics.