Improvement in dielectric properties of polyacrylate copolymers by engineering the interphase region with polymer-grafted reduced graphene oxide

IF 5.3 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY Materials Research Bulletin Pub Date : 2024-07-15 DOI:10.1016/j.materresbull.2024.112999

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Abstract

In this study, an innovative interfacial design strategy aimed to investigate the effects of interfacial interactions between the matrix and reduced graphene oxide (rGO) on the dielectric properties of nanocomposites. The polymer matrices with varying comonomer ratios of butyl acrylate and methyl methacrylate were synthesized to deliberately engineer diverse interfacial interactions with polymer-grafted reduced graphene oxide. Through this approach, fine-tuned interfacial interactions between the polymer matrix and polymer-grafted rGO were achieved, which was verified by FE-SEM, DSC, and DMTA analysis. Subsequently, the dielectric properties of the nanocomposites were investigated to elucidate the relationship between interfacial strength and dielectric efficiency. It was found that polymer nanocomposites with enhanced interfacial interactions exhibit higher dielectric permittivity compared to the neat matrix. This enhancement was attributed to the increased charge storage in the interfacial area and improved alignment of polarizable polymer chains in the interphase between the polymer matrix and polymer-grafted rGO.

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通过对聚合物接枝还原石墨烯氧化物的相间区进行工程改造来改善聚丙烯酸酯共聚物的介电性能

本研究采用创新的界面设计策略，旨在研究基体与还原型氧化石墨烯（rGO）之间的界面相互作用对纳米复合材料介电性能的影响。我们合成了具有不同丙烯酸丁酯和甲基丙烯酸甲酯共聚物比率的聚合物基体，以有意识地设计与聚合物接枝的还原型氧化石墨烯之间的各种界面相互作用。通过这种方法，聚合物基体与聚合物接枝的还原型氧化石墨烯之间实现了微调的界面相互作用，并通过 FE-SEM、DSC 和 DMTA 分析进行了验证。随后，研究了纳米复合材料的介电性能，以阐明界面强度与介电效率之间的关系。研究发现，与纯基体相比，界面相互作用增强的聚合物纳米复合材料表现出更高的介电常数。这种增强归因于界面区域电荷存储的增加以及聚合物基体和聚合物接枝 rGO 之间相间的可极化聚合物链排列的改善。

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来源期刊

Materials Research Bulletin 工程技术-材料科学：综合

CiteScore

9.80

自引率

5.60%

发文量

372

审稿时长

42 days

期刊介绍： Materials Research Bulletin is an international journal reporting high-impact research on processing-structure-property relationships in functional materials and nanomaterials with interesting electronic, magnetic, optical, thermal, mechanical or catalytic properties. Papers purely on thermodynamics or theoretical calculations (e.g., density functional theory) do not fall within the scope of the journal unless they also demonstrate a clear link to physical properties. Topics covered include functional materials (e.g., dielectrics, pyroelectrics, piezoelectrics, ferroelectrics, relaxors, thermoelectrics, etc.); electrochemistry and solid-state ionics (e.g., photovoltaics, batteries, sensors, and fuel cells); nanomaterials, graphene, and nanocomposites; luminescence and photocatalysis; crystal-structure and defect-structure analysis; novel electronics; non-crystalline solids; flexible electronics; protein-material interactions; and polymeric ion-exchange membranes.