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Synergetic effect of nanoclay and nano-CaCO3 hybrid filler systems on the foaming properties and cellular structure of polystyrene nanocomposite foams using supercritical CO2
Cellular Polymers ( IF 1.6 ) Pub Date : 2020-01-22 , DOI: 10.1177/0262489319900948
Xinghan Lian 1 , Wenjie Mou 1 , Tairong Kuang 2, 3 , Xianhu Liu 4 , Shuidong Zhang 1 , Fangfang Li 1 , Tong Liu 1 , Xiangfang Peng 1
Affiliation  

Supercritical fluids have been widely used to prepare various polymer nanocomposite foams due to their high-efficiency, rich-resource, and environment-friendly characteristics. In this work, we prepared polystyrene (PS) nanocomposites with different contents of hybrid fillers of nanoclay and nano-calcium carbonate (nano-CaCO3) and then were foamed by batch foaming method using supercritical carbon dioxide as a physical blowing agent. The effect of hybrid nanofillers components and foaming temperature and pressure on the foaming properties and cellular structure of PS nanocomposite foams was systematically investigated. Dynamic rheology results indicated that the complex viscosity and storage modulus were enhanced with the addition of hybrid fillers. Scanning electron microscopic images show that all samples foamed uniformly macrocells under the given conditions. More importantly, the hybrid fillers of nano-CaCO3 and nanoclay exhibit a significant synergistic effect in improving PS foaming properties, which can be ascribed to the different roles of the two fillers during cell nucleation and cell growth. For instance, the PS/0.22/0.88 nanocomposite foamed under the conditions of 20 MPa and 130°C has shown the finest cell structure (higher cell density of 1.91 × 1010 and smaller cell diameter of 2.28 µm) due to the coeffect of the hybrid nanofillers. Finally, the synergistic mechanism of these two nanofillers on PS foaming behavior was discussed.

中文翻译:

纳米粘土和纳米 CaCO3 混合填料体系对使用超临界 CO2 的聚苯乙烯纳米复合泡沫的发泡性能和多孔结构的协同作用

超临界流体以其高效、资源丰富和环境友好的特点被广泛用于制备各种聚合物纳米复合泡沫材料。在这项工作中,我们制备了具有不同含量的纳米粘土和纳米碳酸钙 (nano-CaCO3) 混合填料的聚苯乙烯 (PS) 纳米复合材料,然后使用超临界二氧化碳作为物理发泡剂通过间歇发泡法发泡。系统地研究了混合纳米填料组分和发泡温度和压力对 PS 纳米复合泡沫的发泡性能和多孔结构的影响。动态流变学结果表明,复合粘度和储能模量随着混合填料的加入而提高。扫描电子显微图像表明,在给定条件下,所有样品均形成均匀的大泡孔。更重要的是,纳米CaCO3和纳米粘土的混合填料在改善PS发泡性能方面表现出显着的协同效应,这可以归因于两种填料在细胞成核和细胞生长过程中的不同作用。例如,在 20 MPa 和 130°C 条件下发泡的 PS/0.22/0.88 纳米复合材料由于杂化的共同作用而表现出最好的泡孔结构(1.91 × 1010 的较高泡孔密度和 2.28 µm 的较小泡孔直径)纳米填料。最后,讨论了这两种纳米填料对PS发泡行为的协同作用机制。纳米CaCO3和纳米粘土的混合填料在改善PS发泡性能方面表现出显着的协同效应,这可以归因于两种填料在细胞成核和细胞生长过程中的不同作用。例如,在 20 MPa 和 130°C 条件下发泡的 PS/0.22/0.88 纳米复合材料由于杂化的共同作用而表现出最好的泡孔结构(1.91 × 1010 的较高泡孔密度和 2.28 µm 的较小泡孔直径)纳米填料。最后,讨论了这两种纳米填料对PS发泡行为的协同作用机制。纳米CaCO3和纳米粘土的混合填料在改善PS发泡性能方面表现出显着的协同效应,这可以归因于两种填料在细胞成核和细胞生长过程中的不同作用。例如,在 20 MPa 和 130°C 条件下发泡的 PS/0.22/0.88 纳米复合材料由于杂化的共同作用而表现出最好的泡孔结构(1.91 × 1010 的较高泡孔密度和 2.28 µm 的较小泡孔直径)纳米填料。最后,讨论了这两种纳米填料对PS发泡行为的协同作用机制。由于混合纳米填料的共同作用,91 × 1010 和较小的细胞直径为 2.28 µm)。最后,讨论了这两种纳米填料对PS发泡行为的协同作用机制。由于混合纳米填料的共同作用,91 × 1010 和较小的细胞直径为 2.28 µm)。最后,讨论了这两种纳米填料对PS发泡行为的协同作用机制。
更新日期:2020-01-22
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