Shao Jiang, Zhou Le, Chen Yuqi, Liu Xue, Ji Mingbo
The School of Mechanical Engineering, Jiangsu University of Science and Technology, Zhenjiang 212100, China.
Research Department, Changzhou Betterial Film Technologies Co., Ltd., Changzhou 213000, China.
Polymers (Basel). 2022 Mar 11;14(6):1121. doi: 10.3390/polym14061121.
The interphase region widely exists in polymer-based nanocomposites, which affects the dielectric properties of the nanocomposites. General models, such as the Knott model, are often used to predict the dielectric constant of nanocomposites, while the model does not take the existence of interphase into account, which leads to a large deviation between the predicted results and the experimental values. In this study, a developed Knott model is proposed by introducing the interphase region and appropriately assuming the properties of the interphase. The modeling results based on the developed model are in good agreement with the experimental data, which verifies the high accuracy of the development model. The influence of nanoparticle loading on the effective volume fraction is further studied. In addition, the effects of the polymer matrix, nanoparticles, interphase dielectric and thickness, nanoparticle size and volume fraction on the dielectric properties of the nanocomposites are also investigated. The results show that polymer matrix or nanoparticles with a high dielectric and thick interphase can effectively improve the dielectric properties of the materials. Small size nanoparticles with high concentrations are more conducive to improving the dielectric properties of the nanocomposites. This study demonstrates that the interphase properties have an important impact on the dielectric properties of nanocomposites, and the developed model is helpful to accurately predict the dielectric constant of polymer-based nanocomposites.
界面相区域广泛存在于聚合物基纳米复合材料中，它会影响纳米复合材料的介电性能。一般模型，如诺特模型，常被用于预测纳米复合材料的介电常数，但该模型未考虑界面相的存在，这导致预测结果与实验值之间存在较大偏差。在本研究中，通过引入界面相区域并适当假设界面相的性质，提出了一种改进的诺特模型。基于该改进模型的建模结果与实验数据吻合良好，验证了改进模型的高精度。进一步研究了纳米粒子负载量对有效体积分数的影响。此外，还研究了聚合物基体、纳米粒子、界面相介电常数和厚度、纳米粒子尺寸和体积分数对纳米复合材料介电性能的影响。结果表明，具有高介电常数和厚界面相的聚合物基体或纳米粒子能有效提高材料的介电性能。高浓度的小尺寸纳米粒子更有利于提高纳米复合材料的介电性能。本研究表明，界面相性质对纳米复合材料的介电性能有重要影响，所开发的模型有助于准确预测聚合物基纳米复合材料的介电常数。
