In this study, the effects of nanoparticle content, polymer/particle interphase, aggregation/agglomeration, and temperature variation on the thermo-mechanical properties of polymer nanocomposites, containing spherical nanoparticles, were investigated. The temperature distribution in the samples was evaluated using a new proposed model on the thermal conductivity of nanocomposites (error < 4%) which also represented unique information about the thermal and physical characteristics of the interphase region. Consequently, the temperature dependency of all physical/mechanical parameters (tensile modulus, yield strength, density, specific heat capacity, etc.) was defined and the results were used to simulate the response mechanism of under-stress nanocomposite samples at a specific thermal condition. PS and PMMA nanocomposites samples containing 1, 2, 3 and 4 vol % of the surface-modified silica nanoparticles were prepared via melt mixing and subjected to tensile, rheology, heat conduction and DMA tests whose results were used to evaluate the accuracy and analyzing the theoretical obtained data. It was revealed that the increment of the nanoparticle content increases the thermal conduction coefficients of the polymer/particle interphase region and the entire system while it decreases the interphase thickness. This led to more significant negative effects of the temperature on the mechanical properties of the nanocomposites. Also, at temperatures about T_g, the under-stress samples with the nanoparticle content of 4 vol% experienced the plastic deformation sooner than the samples with nanoparticle content of 1 vol%.

在这项研究中，研究了纳米颗粒含量、聚合物/颗粒界面、聚集/附聚和温度变化对含有球形纳米颗粒的聚合物纳米复合材料的热机械性能的影响。使用新提出的纳米复合材料热导率模型（误差 < 4%）评估样品中的温度分布，该模型也代表了关于相间区域的热和物理特性的独特信息。因此，定义了所有物理/机械参数（拉伸模量、屈服强度、密度、比热容等）的温度依赖性，并将结果用于模拟特定热条件下应力下纳米复合材料样品的响应机制. PS和PMMA纳米复合材料样品含有1，通过熔融混合制备 2、3 和 4 vol% 的表面改性二氧化硅纳米粒子，并进行拉伸、流变、热传导和 DMA 测试，其结果用于评估准确性和分析理论获得的数据。结果表明，纳米颗粒含量的增加增加了聚合物/颗粒界面区域和整个系统的热传导系数，同时降低了界面厚度。这导致温度对纳米复合材料的机械性能产生更显着的负面影响。此外，在大约 T 热传导和 DMA 测试，其结果用于评估准确性和分析理论获得的数据。结果表明，纳米颗粒含量的增加增加了聚合物/颗粒界面区域和整个系统的热传导系数，同时降低了界面厚度。这导致温度对纳米复合材料的机械性能产生更显着的负面影响。此外，在大约 T 热传导和 DMA 测试，其结果用于评估准确性和分析理论获得的数据。结果表明，纳米颗粒含量的增加增加了聚合物/颗粒界面区域和整个系统的热传导系数，同时降低了界面厚度。这导致温度对纳米复合材料的机械性能产生更显着的负面影响。此外，在大约 T_g，纳米颗粒含量为 4 vol% 的欠应力样品比纳米颗粒含量为 1 vol% 的样品经历塑性变形更快。