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Humidity regulation by stretched PP and PLA films with dispersed CaCl2

  • 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.

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Metadaten
Author:Sven SängerlaubORCiDGND, Oliver Miesbauer, Linda Michael, Kajetan MüllerGND, Cornelia Stramm, Marek J. PecynaGND, Horst-Christian LangowskiORCiDGND
DOI:https://doi.org/10.1002/app.45713
Identifier:0021-8995 OPAC HS OPAC extern
Parent Title (English):Journal of Applied Polymer Science
Publisher:Wiley
Place of publication:New York
Document Type:Article
Language:English
Year of first Publication:2017
Tag:Active Packaging; Biopolymers and renewable Polymers; Blends; Films; Thermoplastics
Volume:135
Issue:3
Article Number:45713
Number of pages:14 Seiten
First Page:45713-1
Last Page:45713-14
Institutes:Fakultät Maschinenbau
Dewey Decimal Classification:6 Technik, Medizin, angewandte Wissenschaften / 66 Chemische Verfahrenstechnik
Publication Lists:Müller, Kajetan
Publication reviewed:begutachtet
Licence (German):Es gilt das deutsche Urheberrecht
Release Date:2021/02/17
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