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首页> 外文期刊>Journal of Applied Polymer Science >Controlling Cellular Morphology by Supercritical Carbon Dioxide
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Controlling Cellular Morphology by Supercritical Carbon Dioxide

机译：通过超临界二氧化碳控制细胞形态

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A series of high-performance porous materials, including open-cell and closed-cell foams, were prepared by a two-stage batch foaming process from fluorinated poly(arylene ether)s, and the porous morphology was characterized with scanning electron microscopy. The effects of saturation pressures, saturation temperatures, transfer times, molecular structures, and solvent traces on the cell sizes, cell densities, and bulk densities of porous materials were examined. According to the conclusions, the porous structures could be controlled with cellular sizes between the nanoscale and microscale. All nanoporous materials have dielectric constants in the ultralow-dielectric-constant range (1.4-2.0). The open Structures call be prepared by two methods, and there are two kinds of morphologies from the two methods, including foams with small, spotlike openings (diameters between 10 and 100 nm) in the cell walls and bicontinuous nanoporous foams. Another special method for controlling the Porous morphology was used here. Films with closed-cell microcellular foams were placed in supercritical carbon dioxide again. The original morphology of the micro-cellular foam collapsed. The collapsed morphology was also characterized with scanning electron microscopy, and three kinds of cellular morphology were observed. (C) 2008 Wiley, Periodicals, Inc. J Appl Polym Sci 111: 2116-2126, 2009
机译：通过氟化聚亚芳基醚的两阶段分批发泡工艺，制备了包括开孔和闭孔泡沫在内的一系列高性能多孔材料，并用扫描电子显微镜表征了多孔形态。研究了饱和压力，饱和温度，转移时间，分子结构和溶剂迹线对多孔材料的孔尺寸，孔密度和堆积密度的影响。根据结论，可以用在纳米级和微米级之间的细胞大小来控制多孔结构。所有纳米多孔材料的介电常数都在超低介电常数范围内（1.4-2.0）。开放结构调用可以通过两种方法来准备，并且两种方法都有两种形态，包括在孔壁中具有小的斑点状开口（直径在10到100 nm之间）的泡沫和双连续纳米多孔泡沫。这里使用了另一种控制多孔形态的特殊方法。将具有闭孔微孔泡沫的薄膜再次置于超临界二氧化碳中。微孔泡沫的原始形态崩溃了。还用扫描电子显微镜表征了塌陷的形态，并观察到三种细胞形态。 （C）2008 Wiley，Periodicals，Inc.J Appl Polym Sci 111：2116-2126，2009

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