Poly(methyl methacrylate) (PMMA)/nano-silica (nano-SiO₂) nanocom-posite film with 256 layers containing different amounts of nano-SiO₂ was manufactured by a new type of micro-nano multilayer co-extrusion technology. The structure, morphology and mechanical properties of PMMA/nano-SiO₂ nanocomposite films were investigated through Fourier transform infrared spectroscopy (FTIR), scanning electron microscope (SEM) and tensile test Besides, molecular dynamics simulation ^J^ was adopted to study the dispersion and content effect on mechanical properties of PMMA/nano-SiO₂ nanocomposite film. It is demonstrated that the tensile strength and the elongation at break of the composites improved with increasing nano-SiO₂ content from 0 to 5 wt%, which was in good agreement with the Molecular Dynamics simulation. And the nanofiller dispersion in the multilayer nanocomposite film was better than that in the single-layer film with equivalent thickness under the effect of torsion lamination. Overall, the best performance was found for the nanocomposites of PMMA with nano-SiO₂ content of 3.5 wt%.

中文翻译：

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PMMA / SiO 2多层纳米复合材料的力学行为：实验和分子动力学模拟

通过新型的微纳米多层共挤技术，制备了具有256层不同含量的纳米SiO _2的聚甲基丙烯酸甲酯（PMMA）/纳米二氧化硅（nano-SiO ₂）纳米复合膜。通过傅立叶变换红外光谱（FTIR），扫描电子显微镜（SEM）和拉伸试验研究了PMMA /纳米SiO ₂纳米复合薄膜的结构，形貌和力学性能。含量对PMMA /纳米SiO ₂纳米复合膜力学性能的影响 结果表明，随着纳米SiO ₂含量的增加，复合材料的拉伸强度和断裂伸长率提高。含量从0到5 wt％，这与分子动力学模拟非常吻合。在扭转层压作用下，多层纳米复合膜中纳米填料的分散性能好于等厚度的单层膜。总体而言，发现具有纳米SiO ₂含量为3.5wt％的PMMA纳米复合材料具有最佳性能。