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首页> 外文期刊>Journal of Applied Polymer Science >Sorption and Diffusion of Volatile Organic Compounds in Fluoroalkyl Methacrylate-Grafted PDMS Membrane
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Sorption and Diffusion of Volatile Organic Compounds in Fluoroalkyl Methacrylate-Grafted PDMS Membrane

机译：甲基丙烯酸氟代烷基酯接枝的PDMS膜中挥发性有机化合物的吸附和扩散

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摘要

Pervaporation is known as an excellent method for the purification of contaminated water, the extraction of aroma compounds, etc, and has been widely studied. The prediction of permeation is important for treatment, extraction, and quantitative analysis. To predict permeation, a solution-diffusion mechanism is proposed. The octanol-water partition coefficient (Pow) has been generally used in expressing hydrophobicity. The hydrophobicity, Pow, is closely related to the solubility of organic compounds. Also, the molecular volume is closely related to the diffusion of organic compounds. In this study, we improved polydimethylsiloxane (PDMS) membranes by plasma grafting of fluoroalkyl methacrylates (FALMA) to enhance the affinity of PDMS to volatile organic compounds (VOCs). Furthermore, we investigated the pervaporation through the plasma-grafted PDMS membrane and the PDMS membrane and the solution-diffusion mechanism of various VOCs. The permselectivity of tetra-chloroethylene(PCE) and toluene determined by the sorption and the diffusion characteristics permeating in the membrane was high. Because the molecular volume of the VOCs is greated that that of water and the permeates quickly penetrate in rubbery membranes like PDMAS, permselectivity was not affected by the diffussivity. Solubility significantly affected the permselectibity during pervaporation through a hydrophobic rubbery membrane.
机译：众所周知，全蒸发是净化污水，提取香气化合物等的极好方法，并且已被广泛研究。渗透的预测对于处理，提取和定量分析非常重要。为了预测渗透，提出了一种溶液扩散机制。辛醇-水分配系数（Pow）通常用于表达疏水性。疏水性Pow与有机化合物的溶解度密切相关。而且，分子体积与有机化合物的扩散密切相关。在这项研究中，我们通过等离子接枝甲基丙烯酸氟烷基酯（FALMA）改进了聚二甲基硅氧烷（PDMS）膜，以增强PDMS对挥发性有机化合物（VOC）的亲和力。此外，我们研究了通过等离子接枝的PDMS膜和PDMS膜的渗透蒸发以及各种VOC的溶液扩散机理。由四氯乙烯（PCE）和甲苯的渗透选择性决定于在膜中的吸附和扩散特性。因为VOC的分子体积比水大，并且渗透物很快渗透到像PDMAS这样的橡胶膜中，所以渗透选择性不受扩散率的影响。通过疏水性橡胶膜渗透时，溶解度显着影响渗透选择性。

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