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首页> 外文期刊>Journal of Applied Polymer Science >Water and water vapor sorption studies in poly(propylene)-zeolite composites
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Water and water vapor sorption studies in poly(propylene)-zeolite composites

机译：聚丙烯-沸石复合材料中水和水蒸气的吸附研究

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Water and water vapor sorption to porous poly(propylene)zeolite composites prepared by hot pressing have been studied as a function of zeolite loading. This work presents the first report on the effect of the zeolite as a filler on the water sorption properties of PP composites. Water swelling experiments were conducted at 25degreesC using pure PP and PP-zeolite film samples having different zeolite loadings (6-40 wt%). Since PP is a hydrophobic polymer, it does not sorp any water, but the composites having 10, 20, 30, and 40% zeolite sorbed 0.63, 1.00, 1.72 and 3.74 wt % water, respectively. The zeolite itself at the same conditions sorbed 24.5 wt % water. As the filler loading in the composites increased, equilibrium uptake values increased too. On the other hand, water vapor sorption and kinetics has been studied using a Cahn 2000 gravimetric sorption system. Within in the range 0.35-0.95%, water vapor was adsorbed by the composites containing 10-40 wt % zeolite. Experimental effective water vapor diffusivities of the composite films were about one order of magnitude higher than the experimental water diffusion coefficient in composites. The transport of water in composites was slower than that in the liquid water due to the longer diffusion pathway and adsorption on the surface of the composites. Although the liquid water may fill all the voids in the composite, water vapor is adsorbed on the surface of the zeolite only. (C) 2003 Wiley Periodicals, Inc. [References: 22]
机译：已经研究了水和水蒸气对通过热压制备的多孔聚（丙烯）沸石复合材料的吸附与沸石载量的关系。这项工作提供了关于沸石作为填料对PP复合材料吸水性能影响的第一份报告。使用具有不同沸石负载量（6-40 wt％）的纯PP和PP沸石膜样品在25℃下进行水溶胀实验。由于PP是疏水性聚合物，因此它不吸收任何水，但是具有10％，20％，30％和40％的沸石的复合材料分别吸附了0.63％，1.00％，1.72％和3.74wt％的水。在相同条件下，沸石本身吸收了24.5重量％的水。随着复合物中填料含量的增加，平衡吸收值也随之增加。另一方面，已经使用Cahn 2000重量吸收系统研究了水蒸气的吸收和动力学。在0.35-0.95％的范围内，水蒸气被包含10-40重量％的沸石的复合物吸附。复合膜的实验有效水蒸气扩散率比复合物中的实验水扩散系数高约一个数量级。由于较长的扩散路径和在复合材料表面的吸附，复合材料中水的传输速度比液态水中的传输慢。尽管液态水可以填充复合材料中的所有空隙，但是水蒸气仅吸附在沸石的表面上。 （C）2003 Wiley Periodicals，Inc. [参考：22]

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