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首页> 外文期刊>Journal of Applied Polymer Science >High-performance PDMS membranes for pervaporative removal of VOCs from water: The role of alkyl grafting
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High-performance PDMS membranes for pervaporative removal of VOCs from water: The role of alkyl grafting

机译：高性能PDMS膜，用于从水中全挥发去除VOC：烷基接枝的作用

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摘要

To improve the pervaporation performance of PDMS membrane, alkyl groups with different chain length were grafted into PDMS matrix. The prepared membranes were characterized by ATR-IR, DSC, TGA, PALS, and tensile testing. The effects of alkyl grafting on pervaporation performance of PDMS membrane were investigated in separation of ethyl acetate/water mixture. Experimental results show that the separation factor of PDMS membrane is largely improved by alkyl grafting because of the enhanced preferential sorption of ethyl acetate, and this improvement depends on alkyl grafting ratio and alkyl chain length. The total flux of PDMS membrane reduces after alkyl grafting owing to the decreased free volume. When grafting ratio is above 6.9%, membrane grafted with shorter alkyl groups is preferred for pervaporation. The best pervaporation performance is achieved by 9% octyl grafted PDMS membranes with a separation factor of 592 and a total flux of 188 gm(-2) h(-1) in separation of 1% ethyl acetate/water mixture at 40 degrees C. Moreover, this octyl grafted PDMS membrane also exhibits excellent separation performance in removal of butyl acetate, methyl-tert-butyl ether, and n-hutanol from water. (C) 2016 Wiley Periodicals, Inc,
机译：为了提高PDMS膜的渗透性能，将不同链长的烷基接枝到PDMS基质中。通过ATR-IR，DSC，TGA，PALS和拉伸测试对制备的膜进行表征。在乙酸乙酯/水混合物的分离中研究了烷基接枝对PDMS膜全蒸发性能的影响。实验结果表明，由于乙酸乙酯的优先吸附增强，烷基接枝大大提高了PDMS膜的分离因子，而这种提高取决于烷基接枝率和烷基链长。烷基接枝后，PDMS膜的总通量由于自由体积的减少而降低。当接枝率高于6.9％时，优选用短烷基接枝的膜进行全蒸发。 9％辛基接枝的PDMS膜具有最佳分离效果，分离系数为592，在40°C下分离1％乙酸乙酯/水的混合物时总通量为188 gm（-2）h（-1）。此外，这种辛基接枝的PDMS膜在从水中除去乙酸丁酯，甲基叔丁基醚和正庚醇方面也显示出优异的分离性能。 （C）2016 Wiley Periodicals，Inc，

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