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Properties of Mosquito Repellent-Plasticized Poly(lactic acid) Strands

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http://hdl.handle.net/2183/29051
Atribución 4.0 Internacional
Except where otherwise noted, this item's license is described as Atribución 4.0 Internacional
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  • GI- Proterm - Artigos [5]
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Title
Properties of Mosquito Repellent-Plasticized Poly(lactic acid) Strands
Author(s)
Mapossa, Antonio B.
López-Beceiro, Jorge
Díaz-Díaz, Ana-María
Artiaga, Ramón
Moyo, Dennis
Mphateng, Thabang N.
Focke, Walter W.
Date
2021-09
Citation
Mapossa, A.B.; López-Beceiro, J.; Díaz-Díaz, A.M.; Artiaga, R.; Moyo, D.S.; Mphateng, T.N.; Focke, W.W. Properties of Mosquito Repellent-Plasticized Poly(lactic acid) Strands. Molecules 2021, 26, 5890. https://doi.org/10.3390/molecules26195890
Abstract
[Abstract] Poly(lactic acid) (PLA) is an attractive candidate for replacing petrochemical polymers because it is fully biodegradable. This study investigated the potential of PLA as a sustainable and environmentally friendly alternative material that can be developed into commercially viable wearable mosquito repellent devices with desirable characteristics. PLA strands containing DEET and IR3535 were prepared by twin screw extrusion compounding and simultaneously functioned as plasticizers for the polymer. The plasticizing effect was investigated by thermal and rheological studies. DSC studies showed that the addition of DEET and IR3535 into PLA strands reduced the glass transition temperature consistent with predictions of the Fox equation, thus proving their efficiency as plasticizers. The rheology of molten samples of neat PLA and PLA/repellents blends, evaluated at 200 °C, was consistent with shear-thinning pseudoplastic behaviour. Raman studies revealed a nonlinear concentration gradient for DEET in the PLA strand, indicating non-Fickian Type II transport controlling the desorption process. Release data obtained at 50 °C showed initial rapid release followed by a slower, near constant rate at longer times. The release rate data were fitted to a novel modification of the Peppas-Sahlin desorption model
Keywords
Mosquito repellents
Polymer strands
Thermal analysis
Rheology
Desorption
 
Description
This article belongs to the Special Issue Thermal and Rheological Characterization of Polymeric Materials
Editor version
https://doi.org/10.3390/molecules26195890
Rights
Atribución 4.0 Internacional
ISSN
1420-3049
Related resource
https://www.mdpi.com/journal/molecules/special_issues/Thermal_Rheological_Polymeric_Materials

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