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  4. Humidity regulation by stretched PP and PLA films with dispersed CaCl2
 
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2018
Journal Article
Title

Humidity regulation by stretched PP and PLA films with dispersed CaCl2

Abstract
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 °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.
Author(s)
Sängerlaub, Sven  
Fraunhofer-Institut für Verfahrenstechnik und Verpackung IVV  
Miesbauer, Oliver
Fraunhofer-Institut für Verfahrenstechnik und Verpackung IVV  
Michael, Linda
Fraunhofer-Institut für Verfahrenstechnik und Verpackung IVV  
Müller, Kajetan  
Fraunhofer-Institut für Verfahrenstechnik und Verpackung IVV  
Stramm, Cornelia  
Fraunhofer-Institut für Verfahrenstechnik und Verpackung IVV  
Pecyna, Marek
Langowski, Horst-Christian  
Fraunhofer-Institut für Verfahrenstechnik und Verpackung IVV  
Journal
Journal of applied polymer science  
DOI
10.1002/app.45713
Language
English
Fraunhofer-Institut für Verfahrenstechnik und Verpackung IVV  
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