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首页> 外文期刊>Physica, B. Condensed Matter >The effect of density fluctuations in supercritical fluids: new science and technology for polymer thin films
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The effect of density fluctuations in supercritical fluids: new science and technology for polymer thin films

机译：超临界流体中密度波动的影响：聚合物薄膜的新科学和技术

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Supercritical carbon dioxide (scCO(2)) is being used increasingly as a green solvent in polymer processing. However, the major disadvantage thus far is that only a limited class of polymers, such as fluorinated or silicone-based polymers, can be dissolved in scCO(2). Here we show that large density fluctuations in scCO(2) can significantly enhance the solubility of scCO(2) with polymer thin films even when the bulk polymers have very poor miscibility with scCO(2). In addition, by utilizing quick solvent evaporation of CO2, we could preserve the swollen structures, resulting in low-density polymer thin films where nanometer-scale porosity was significantly introduced. The use of the low-density polymer thin films could allow us to develop a new gas membrane that could selectively permit a large flow of small molecule gases, such as O-2 and CO2, while completely blocking out larger gases or particulates. (C) 2004 Elsevier B.V. All rights reserved.
机译：超临界二氧化碳（scCO（2））在聚合物加工中越来越多地用作绿色溶剂。但是，到目前为止的主要缺点是只能将有限种类的聚合物（例如氟化或硅基聚合物）溶解在scCO（2）中。在这里，我们显示，即使散装聚合物与scCO（2）的混溶性很差，scCO（2）的大密度波动也可以显着提高scCO（2）与聚合物薄膜的溶解度。另外，通过利用快速的溶剂蒸发CO2，我们可以保留溶胀的结构，从而形成低密度的聚合物薄膜，其中显着引入了纳米级孔隙率。低密度聚合物薄膜的使用可以使我们开发出一种新型的气体膜，该膜可以选择性地允许小分子气体（例如O-2和CO2）大量流动，同时完全阻挡较大的气体或微粒。 （C）2004 Elsevier B.V.保留所有权利。

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