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首页> 外文期刊>Journal of Applied Polymer Science >Breathable polymer films produced by the microlayer coextrusion process
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Breathable polymer films produced by the microlayer coextrusion process

机译：通过微层共挤工艺生产的透气聚合物薄膜

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Fabrication of a breathable film by the microlayer coextrusion process is described. Poly(ethylene oxide) (PEO) was microlayered with a filled polyolefin, either CaCO3-filled polyethylene or CaCO3-filled polypropylene. The thickness of individual layers was varied by increasing the total number of layers in the microlayered film from 8 to 4096. The water vapor transport rate (WVTR) was measured for microlayer films that varied in composition and number of layers. Especially with the PP(CaCO3)/PEO system, systematic variation in composition and number of layers made it possible to obtain large changes in the WVTR. The results were related to the tortuousity of the pathway through the microlayer. The filled polyolefins acted as a barrier to water vapor transport through the hydrophilic PEG. As the individual layers were made thinner by increasing the total number of layers, the polyolefin layers changed from continuous to discontinuous. Tortuousity concepts were used to correlate the increase in WVTR with an effective aspect ratio of the discontinuous polyolefin layers. In addition to high WVTR values, the breathable films produced by microlayering PEO with a filled polyolefin exhibited excellent mechanical properties. (C) 2000 John Wiley & Sons, Inc. [References: 32]
机译：描述了通过微层共挤出工艺制造透气膜。聚环氧乙烷（PEO）与填充的聚烯烃（CaCO3填充的聚乙烯或CaCO3填充的聚丙烯）微层。通过将微层膜中的总层数从8增加到4096，可以改变各个层的厚度。对于组成和层数均不同的微层膜，测量了水蒸气传输速率（WVTR）。尤其是对于PP（CaCO3）/ PEO系统，系统的组成和层数变化使得有可能获得WVTR的较大变化。结果与通过微层的路径的曲折性有关。填充的聚烯烃充当水蒸气通过亲水性PEG传输的屏障。由于通过增加总层数使各个层更薄，因此聚烯烃层从连续变为不连续。曲折的概念被用来将WVTR的增加与不连续聚烯烃层的有效纵横比相关联。除了较高的WVTR值外，通过将PEO与填充的聚烯烃微层化生产的透气膜还表现出出色的机械性能。 （C）2000 John Wiley＆Sons，Inc. [参考：32]

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