{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,4]],"date-time":"2026-09-04T16:36:03Z","timestamp":1788539763527,"version":"build-2803163510"},"reference-count":25,"publisher":"MDPI AG","issue":"9","license":[{"start":{"date-parts":[[2025,5,6]],"date-time":"2025-05-06T00:00:00Z","timestamp":1746489600000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"DOI":"10.13039\/501100005908","name":"Federal Ministry of Food and Agriculture","doi-asserted-by":"publisher","award":["2220NR041A, Akronym: DiBioK"],"award-info":[{"award-number":["2220NR041A, Akronym: DiBioK"]}],"id":[{"id":"10.13039\/501100005908","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Molecules"],"abstract":"<jats:p>Poly(lactic acid) (PLA) is one of the most important bio-based and industrial compostable materials in food packaging. Its barrier properties towards oxygen and moisture are well documented. However, data on barrier properties of PLA towards organic molecules are scarce in the literature. This study investigated the diffusion of various organic molecules, including n-alkanes, 1-alcohols, 2-ketones, ethers, esters, amines, and aromatics, in two commercial PLA films with thicknesses of 20 \u00b5m and 30 \u00b5m. The diffusion coefficient (DP) values were determined from lag time in permeation tests conducted at temperatures ranging from 20 \u00b0C to 90 \u00b0C. The films were also characterized in terms of crystallinity, rigid and mobile amorphous fractions, and molecular weight. Activation energies (EA) were calculated based on the temperature dependence of the DP using the Arrhenius approach. In total, 290 DP values for 55 individual substances were determined, and 38 EA values were derived from these data. The EA correlated well with the molecular volume of the investigated substances. Moreover, the pre-exponential factor D0 showed a correlation with EA. These correlations enabled the establishment of diffusion modeling parameters for PLA, allowing the prediction of DP for untested substances. The diffusion behavior of PLA was further compared with the literature data for polyethylene terephthalate and polyethylene naphthalate, providing insights into the relative performance of these materials.<\/jats:p>","DOI":"10.3390\/molecules30092064","type":"journal-article","created":{"date-parts":[[2025,5,6]],"date-time":"2025-05-06T11:38:06Z","timestamp":1746531486000},"page":"2064","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":4,"title":["Diffusion Coefficients and Activation Energies of Diffusion of Organic Molecules in Poly(lactic acid) Films"],"prefix":"10.3390","volume":"30","author":[{"given":"Johann","family":"Ewender","sequence":"first","affiliation":[{"name":"Fraunhofer Institute for Process Engineering and Packaging (IVV), 85354 Freising, Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-4378-359X","authenticated-orcid":false,"given":"Rafael","family":"Auras","sequence":"additional","affiliation":[{"name":"School of Packaging, Michigan State University, East Lansing, MI 48824, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-5535-9502","authenticated-orcid":false,"given":"Uruchaya","family":"Sonchaeng","sequence":"additional","affiliation":[{"name":"School of Packaging, Michigan State University, East Lansing, MI 48824, USA"},{"name":"Department of Packaging and Materials Technology, Faculty of Agro-Industry, Kasetsart University, Bangkok 10900, Thailand"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-7529-6799","authenticated-orcid":false,"given":"Frank","family":"Welle","sequence":"additional","affiliation":[{"name":"Fraunhofer Institute for Process Engineering and Packaging (IVV), 85354 Freising, Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2025,5,6]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"820","DOI":"10.1016\/j.progpolymsci.2008.05.004","article-title":"Processing technologies of poly(lactic acid)","volume":"33","author":"Lim","year":"2008","journal-title":"Prog. 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