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首页> 外文期刊>Journal of Membrane Science >Relationship between the gas and liquid water permeabilities and membrane structure in homogeneous and pseudo-bilayer membranes based on partially hydrolyzed poly(ethylene-co-vinyl acetate)
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Relationship between the gas and liquid water permeabilities and membrane structure in homogeneous and pseudo-bilayer membranes based on partially hydrolyzed poly(ethylene-co-vinyl acetate)

机译：基于部分水解聚（乙烯-共-乙酸乙烯酯）的均相膜和拟双层膜中气体和液体水的渗透性与膜结构的关系

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摘要

The permeation of CO2, O-2 and liquid water through homogeneous and pseudo-bilayer membranes based on partially hydrolyzed poly(ethylene-co-vinyl acetate) (EVA) was studied as a function of the hydroxyl group content. It was found that the transport properties for gas and water are related to the membrane structure. Increasing the rigidity of the polymer chains and the crystallinity of the films, through longer hydrolysis, leads to enhance water and gas barrier properties, even though the films become more hydrophilic. When the hydroxyl group content increases, the ideal separation factors of water to gas permeation are significantly improved in the pseudo-bilayer membranes in comparison with the homogeneous membranes. In the pseudo-bilayer membranes, the water flux from the partially hydrolyzed layer towards the EVA layer is higher than the flux in the opposite direction. This reverse flow effect becomes more pronounced with a longer hydrolysis reaction time. The anisotropy of the water flux is governed by the partially hydrolyzed layer, which is less permeable than the EVA layer. The water permeation through the membranes used in this study is more affected by the water diffusivity than by the affinity between the material and the water molecules. (c) 2005 Elsevier B.V. All rights reserved.
机译：研究了基于部分水解的聚（乙烯-共-乙酸乙烯酯）（EVA）的均相膜和假双层膜对CO2，O-2和液态水的渗透率与羟基含量的关系。发现气体和水的传输性质与膜结构有关。通过更长的水解时间来提高聚合物链的刚性和薄膜的结晶度，即使薄膜变得更加亲水，也可以增强水和气体的阻隔性能。当羟基含量增加时，与均质膜相比，假双层膜中水与气体渗透的理想分离因子得到了显着改善。在伪双层膜中，从部分水解层到EVA层的水通量高于相反方向的通量。随着更长的水解反应时间，这种逆流效应变得更加明显。水通量的各向异性由部分水解的层控制，该层的渗透性低于EVA层。通过本研究使用的膜的水渗透受水扩散率的影响比受材料与水分子之间的亲和力的影响更大。 （c）2005 Elsevier B.V.保留所有权利。

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