EVA/纳米TiO_2复合材料的性能及其数值模拟

Preparation and simulation of effective properties of EVA/nano-TiO_2 composite material

采用一步法制备EVA/TiO2纳米复合材料,应用FESEM和SEM方法研究分散状态和断面形貌,并测试纳米复合材料的力学性能。进一步利用均匀化理论和有限元相结合的方法模拟EVA/TiO2纳米复合材料的有效性能。结果表明:纳米TiO2微粒在EVA基体中分散良好,拉伸强度、断裂伸长率和弹性模量均有所提高,起到了增强增韧作用;填充圆形和方形TiO2颗粒的复合材料有效性能,均随填充量的增加而增加;同一填充量时,填充颗粒为方形的大于填充颗粒为圆形的材料的有效性能;等效弹性模量与实验所得的结果基本趋势一致,圆形颗粒的计算结果更接近实验结果。

EVA/TiO2 nano-composite material were prepared by the one-step method.The dispersion morphology and the tensile-fractured surfaces of material were studied by FESEM and SEM.And the mechanical properties of nano-composite material were tested.The means of homogenization method and finite element method was deduced to simulate the effective properties of EVA/TiO2 nano-composite material.It was showed that nano-TiO2 particles were well distributed in EVA matrix.The tensile strength,fracture elongation rate and modulus of elasticity of nano-composite material were improved,which resulted in the effect of reinforcing and toughening.The effective properties of nano-composite material increased upon increasing the concentration of nano-TiO2,no matter the filled particles were quadrate or round.The effective elastic modulus of quadrate particle-filled composites was bigger than that of round particle-filled composites,when equivalent amount of nanoparticle was filled in matrix.The results of the simulation and the test were accordant basically,and the results of round nanoparticles filled in matrix were much better than that of quadrate nanoparticles.