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Structure, Properties, and Release Kinetics of the Polymer/Insect Repellent System Poly ( l -Lactic Acid)/Ethyl Butylacetylaminopropionate (PLLA/IR3535)

ORCID
0000-0002-5129-5860
Affiliation
Interdisciplinary Center for Transfer-Oriented Research in Natural Sciences (IWE TFN), Martin Luther University Halle-Wittenberg, D-06099 Halle (Saale), Germany
Du, Fanfan;
ORCID
0000-0003-2521-186X
Affiliation
Institute for Biopolymers and Sustainability (ibp), University of Applied Sciences Hof, D-95028 Hof (Saale), Germany
Erdmann, Rafael;
ORCID
0000-0002-2920-7019
Affiliation
Institute of Physics, Martin Luther University Halle-Wittenberg, D-06099 Halle (Saale), Germany
Petzold, Albrecht;
Affiliation
Polymer Service GmbH Merseburg (PSM), D-06217 Merseburg, Germany
Wutzler, Andre;
Affiliation
Leibniz-Institut für Polymerforschung Dresden e. V., Hohe Str. 6, D-01069 Dresden, Germany
Leuteritz, Andreas;
ORCID
0000-0002-8017-4849
Affiliation
Institute for Biopolymers and Sustainability (ibp), University of Applied Sciences Hof, D-95028 Hof (Saale), Germany
Nase, Michael;
Affiliation
Interdisciplinary Center for Transfer-Oriented Research in Natural Sciences (IWE TFN), Martin Luther University Halle-Wittenberg, D-06099 Halle (Saale), Germany
Androsch, René

The insect repellent ethyl butylacetylaminopropionate (IR3535) was used as a functional additive for poly ( l -lactic acid) (PLLA) to modify its structure and mechanical properties and achieve insect repellency. PLLA/IR3535 mixtures at various compositions were prepared via melt extrusion. In the analyzed composition range of 0 to 23 m% IR3535, PLLA and IR3535 were miscible at the length scale represented by the glass transition temperature. Addition of IR3535 resulted in a significant decrease in the glass transition temperature of PLLA, as well as in the elastic modulus, indicating its efficiency as a plasticizer. All mixtures were amorphous after extrusion, though PLLA/IR3535 extrudates with an IR3535 content between 18 and 23 m% crystallized during long-term storage at ambient temperature, due to their low glass transition temperature. Quantification of the release of IR3535 into the environment by thermogravimetric analysis at different temperatures between 50 and 100 °C allowed the estimation of the evaporation rate at lower temperatures, suggesting an extremely low release rate with a time constant of the order of magnitude of 1–2 years at body temperature.

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