Multilayer membranes prepared via microlayer coextrusion have attracted wide attention due to their unique properties and broad applications. In present study, the foam/film alternating multilayer sheets based on ethylene-vinyl acetate copolymer (EVA) and high-density polyethylene are successfully prepared via microlayer coextrusion. The cells in the sheets are single-cell-array along the foamed EVA layers with uniform cell size. In addition, the effects of layer number and foam relative thickness on morphology, mechanical properties, damping and heat insulation properties are investigated. The cell size decreases significantly with increasing layer number due to the enhanced confine effects. The tensile strength, elongation at break, and heat insulation also increase significantly. However, the mechanical damping properties change little in the observed frequency. Meanwhile, with higher relative thickness of EVA foam, the sheets have lower tensile strength and lower thermal conductivity, while the damping properties are enhanced in a specific frequency scope. The elongation at break of the optimized sample comes to 800% and the thermal conductivity decreases to 61 mW·m⁻¹·K⁻¹, which shows high toughness and low thermal conductivity, indicating a possible method for preparing materials with high toughness and heat-insulating properties.

通过微层共挤出制备的多层膜由于其独特的性能和广泛的应用而引起了广泛的关注。在本研究中，成功​​地通过以下方法制备了基于乙烯-乙酸乙烯酯共聚物（EVA）和高密度聚乙烯的泡沫/膜交替多层片材微层共挤出。片中的泡孔沿着发泡的EVA层是单泡孔阵列，泡孔尺寸均匀。此外，研究了层数和泡沫相对厚度对形态，机械性能，阻尼和隔热性能的影响。由于增强的限制效应，单元大小随着层数的增加而显着减小。拉伸强度，断裂伸长率和隔热性也显着提高。但是，机械阻尼特性在观察到的频率中变化很小。同时，当EVA泡沫的相对厚度较高时，片材具有较低的拉伸强度和较低的导热性，而在特定频率范围内阻尼性能增强。^-1 ·K ^-1，显示高韧性和低导热率，表明制备具有高韧性和绝热性能的材料的可能方法。