The objective was to explore a new approach to prepare multilayered poly(methyl methacrylate)/polystyrene/poly(methyl methacrylate) (PMMA/PS/PMMA) foams composed of two polymers with similar foaming window whereas different foaming characteristics. This approach involved a thermal compression of PMMA, PS and PMMA sheets, and a subsequent batch foaming process. To improve the interfacial adhesion, two layers of PS/PMMA blend were prepared via spin-coating of a common solution of PS and PMMA in chloroform onto both sides of the PS sheet. This treatment remarkably widened the foaming window, enabling preparation of multilayer PMMA/PS/PMMA foams with a controllable bimodal cell size distribution. By increasing the concentration of the adhesive, the gas desorption coefficient was adjusted, the expansion ratio was increased, and the cell sizes within two layers were successfully tuned. This study suggests an effective and convenient approach for preparing multilayered foams with bimodal cell size distribution.

目的是探索一种新的方法，以制备由两种具有相似发泡窗口但发泡特性不同的聚合物组成的多层聚（甲基丙烯酸甲酯）/聚苯乙烯/聚（甲基丙烯酸甲酯）（PMMA / PS / PMMA）泡沫。这种方法涉及对PMMA，PS和PMMA片材进行热压缩，以及随后的分批发泡过程。为了改善界面粘合力，通过将PS和PMMA的普通溶液在氯仿中的旋涂到PS片的两面上，制备了两层PS / PMMA混合物。该处理显着加宽了发泡窗口，从而能够制备具有可控双峰孔尺寸分布的多层PMMA / PS / PMMA泡沫。通过增加粘合剂的浓度，调节气体的脱附系数，增加膨胀率，并且成功调整了两层内的像元大小。这项研究提出了一种有效且方便的方法来制备具有双峰孔尺寸分布的多层泡沫。