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Biodegradable Mulch Films Based on Starch/Poly (Lactic Acid)/Poly (ε-Caprolactone) Ternary Blends

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Abstract

Novel formulations based on corn starch (CS), thermoplastic starch (TPS), poly (lactic acid) (PLA) and poly (ε-caprolactone) (PCL) were developed in order to evaluate their performance as agricultural mulch films. Neat PLA and PCL samples, binary and ternary films were prepared using a Brabender type mixer. In order to determine the impact of the PCL on final micro- and macroscopic properties of PLA/CS and PLA/TPS formulations with different PCL contents added. The structural, morphological, thermal, rheological, mechanical properties, biodegradation tests, as well as water interaction properties were studied. The obtained results indicated that the introduction of PCL into the PLA/CS and PLA/TPS binary blends caused slight changes. As promising results, bioassays indicated that the growth of tomato plants was positively affected by using these blends based on PLA/CS and PLA/TPS as biodegradable mulch films (BDMs); even, the results were similar as low-density polyethylene (LDPE) particularly: temperature and water retention tomato and weed fresh weights, and chlorophyll content. LDPE is the most generally used material as agricultural mulch films and the mentioned parameters were superior to uncovered tray as control.

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Acknowledgements

We wish to thank Leonardo Cano (UNMdP/INTEMA) for helping us in this work.

Funding

This work was supported by grants from Consejo Nacional de Investigaciones Científicas y Técnicas de la República Argentina (CONICET) (PIP 0617), Agencia Nacional de Promoción de la Investigación, el Desarrollo Tecnológico y la Innovación (Agencia I + D + i) (PICT2020-SERIE A-02207, PICT-2017–0603, ANPCyT PICT 2020 – 3137, CONICET PIP 2021–2023, UNMdP 15/G61, UNMdP ING622/21, PICT start-up 008 and PICT 0959) and Universidad Nacional de Mar del Plata (15/G556 and ING560/19).

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  1. Grupo de Materiales Compuestos Termoplásticos (CoMP), Instituto de Investigaciones en Ciencia y Tecnología de Materiales (INTEMA), Facultad de Ingeniería, Universidad Nacional de Mar del Plata (UNMdP) y Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Avenida Colón 10850, 7600, Mar del Plata, Buenos Aires, Argentina

    Matías Menossi, Nazarena Rivilli, Andrés Torres Nicolini, Vera A. Alvarez & Leandro N. Ludueña

  2. Grupo de Fisiología del Estrés en Plantas, Instituto de Investigaciones Biológicas (IIB), Facultad de Ciencias Exactas y Naturales, UNMdP y CONICET, Deán Funes 3250, 7600, Mar del Plata, Buenos Aires, Argentina

    Florencia Salcedo

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  1. Matías Menossi
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Contributions

Conceptualization: M.M.; Methodology: M.M., N.R., A.T.N., F.S.; Software: M.M.; Data curation: M.M., N.R., A.T.N., F.S.; Writing – original draft presentation: M.M.; Visualization: M.M.; Investigation: M.M., N.R., F.S., A.T.N., V.A.A.; L.N.L.; Supervision: V.A.A., L.N.L.; Validation: M.M.; Writing – Reviewing and Editing: V.A.A, L.N.L.

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Correspondence to Matías Menossi.

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Menossi, M., Salcedo, F., Rivilli, N. et al. Biodegradable Mulch Films Based on Starch/Poly (Lactic Acid)/Poly (ε-Caprolactone) Ternary Blends. J Polym Environ 31, 2114–2137 (2023). https://doi.org/10.1007/s10924-022-02721-w

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