TY - JOUR A1 - Sängerlaub, Sven A1 - Miesbauer, Oliver A1 - Michael, Linda A1 - Müller, Kajetan A1 - Stramm, Cornelia A1 - Pecyna, Marek J. A1 - Langowski, Horst-Christian T1 - Humidity regulation by stretched PP and PLA films with dispersed CaCl2 T2 - Journal of Applied Polymer Science N2 - 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. KW - Active Packaging KW - Biopolymers and renewable Polymers KW - Blends KW - Films KW - Thermoplastics Y1 - 2017 UR - https://opus4.kobv.de/opus4-hs-kempten/frontdoor/index/index/docId/607 SN - 0021-8995 VL - 135 IS - 3 SP - 45713-1 EP - 45713-14 PB - Wiley CY - New York ER -