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<p><i>Nowadays, wide application of polymer nanocomposites from automotive parts to medical instruments makes it an important material in engineering field. The knowledge of basic mechanical properties like hardness and impact resistance helps in the determining the real life sustainability of the polymer composites in sudden loading cases.</i> This study investigates the morphological effects of alumina nanoparticles on the impact strength and Shore Hardness Number of epoxy resin nanocomposites. <i>Using the Response Surface Methodology, process parameters like nanoparticle weight percentage, ultrasonication frequency, and time were optimized.</i> Transmission Electron Microscopy confirmed almost uniform dispersion of nanoparticles at lower concentrations; however, <i>agglomeration was observed at higher weight percentages since the alumina nanoparticles were chemically untreated</i>. Scanning Electron Microscopy of fractured surfaces revealed distinct toughening mechanisms such as crack deflection and particle pull-out. Results <i>highlighted</i> the critical role of nanoparticle shape, dispersion quality, and process optimization in enhancing the multifunctional performance of epoxy nanocomposites. A regression model in terms of process parameters were developed for the Shore Hardness Number and impact strength. Maximum value of Shore Hardness Number and impact strength was found to be 113 ± 2.5 (SHN) and 4.52 ± 0.25 (kJ/m<sup>2</sup>) respectively.</p>

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An Experimental Study on the Mechanical Properties and Microstructure of Epoxy-Al2O3 Polymer Nanocomposites

  • 期刊论文

  • 发表日期：

    2025年12月20日

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  • Sudhir Kumar Mishra,
  • Nagendra Kumar Maurya,
  • Abhishek Pandey

摘要

Nowadays, wide application of polymer nanocomposites from automotive parts to medical instruments makes it an important material in engineering field. The knowledge of basic mechanical properties like hardness and impact resistance helps in the determining the real life sustainability of the polymer composites in sudden loading cases. This study investigates the morphological effects of alumina nanoparticles on the impact strength and Shore Hardness Number of epoxy resin nanocomposites. Using the Response Surface Methodology, process parameters like nanoparticle weight percentage, ultrasonication frequency, and time were optimized. Transmission Electron Microscopy confirmed almost uniform dispersion of nanoparticles at lower concentrations; however, agglomeration was observed at higher weight percentages since the alumina nanoparticles were chemically untreated. Scanning Electron Microscopy of fractured surfaces revealed distinct toughening mechanisms such as crack deflection and particle pull-out. Results highlighted the critical role of nanoparticle shape, dispersion quality, and process optimization in enhancing the multifunctional performance of epoxy nanocomposites. A regression model in terms of process parameters were developed for the Shore Hardness Number and impact strength. Maximum value of Shore Hardness Number and impact strength was found to be 113 ± 2.5 (SHN) and 4.52 ± 0.25 (kJ/m2) respectively.