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Humidity regulation by stretched PP and PLA films with dispersed CaCl2

机译:用分散的CaCl2拉伸PP和PLA膜的湿度调节

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摘要

Polymer materials that regulate the relative humidity in their environment are relevant for applications in the packaging and building sectors. By integration of salts in polymer structures, such materials are able to absorb and desorb high amounts of water vapor. In this study, films of polylactic acid and polypropylene with dispersed calcium chloride (2 and 4 wt %) were produced and biaxially stretched to induce the formation of cavities. The resulting cavities in these films account up to 10 vol % and are able to contain emerging calcium chloride solution formed by water vapor absorption. These films absorb reversibly up to 15 wt % water vapor at 75% relative humidity at 23 degrees C. This absorption behavior is described by effective diffusion and effective sorption coefficients. Using a simple model, the effective water vapor diffusion coefficient of these films can be estimated from the permeation coefficient of the polymer and the sorption coefficient of the absorber. (c) 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018, 135, 45713.
机译:调节其环境中相对湿度的聚合物材料与包装和建筑物部门的应用相关。通过在聚合物结构中整合盐,这种材料能够吸收和解吸大量水蒸气。在该研究中,制备聚乳酸和聚丙烯的聚乳酸和聚丙烯薄膜(2和4wt%),并双轴拉伸以诱导腔的形成。这些薄膜中的所得腔占10Vol%,并且能够含有通过水蒸气吸收形成的出现的氯化钙溶液。这些薄膜在23摄氏度下以75%相对湿度可逆地吸收到15wt%的水蒸气。通过有效的扩散和有效的吸附系数描述这种吸收行为。使用简单的模型,可以从聚合物的渗透系数和吸收剂的吸附系数估计这些膜的有效水蒸气扩散系数。 (c)2017 Wiley期刊,Inc.J.Phill。聚合物。 SCI。 2018,135,45713。

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