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Biodegradation of PLA/CNC composite modified with non-ionic surfactants

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Abstract

Poly(lactic acid) (PLA) undergoes degradation through the action of microorganisms and enzymes that can degrade it by composting. The goal of this work was to observe the degradation/disintegration behavior in garden soil of neat PLA and PLA composites with 3 wt% cellulose nanocrystals (CNC) modified or not with non-ionic surfactants (S) at a weight ratio of 1:1 (CNC:S). Four types of non-ionic surfactants with hydrophilic-lipophilic balance (HLB) ranging from 4.3 to 16.7 were tested: sorbitan monolaurate (Span 20), sorbitan monooleate (Span 80), polyoxyethylene sorbitan monolaurate (Tween 20) and polyoxyethylene sorbitan monooleate (Tween 80). Films were obtained by solution casting, cut into 2 × 2 cm strips and buried in garden soil, while monitoring the temperature and humidity for 150 days. Changes in the films by visual inspection, polarized light microscopy, thermogravimetric analysis (TGA) and Fourier-transform infrared spectroscopy (FTIR) were observed. Results showed that the addition of surfactants favored the rate of biodegradation of the composites, being the lowest molecular weight the determinant property of the surfactant to enhance biodegradation rate of PLA/CNC/S composites. Nevertheless, for surfactants belonging to the same chemical family, the highest biodegradation rate for PLA/CNC/S composite obeys the principle of high HLB, and low spherulite size.

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Source: Sigma-Aldrich

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Acknowledgements

The authors gratefully acknowledge Foundation for Science and Technology of the State of Pernambuco (FACEPE) for their financial support of this study. Thanks are also due to the Biomaterials and Biosystems Laboratory (LAMAB/UFPB) and Polymer Materials and Characterization Laboratory (LMPC/UFPE) for sample characterizations.

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Authors and Affiliations

  1. Department of Chemical Engineering, Federal University of Pernambuco — UFPE, Av. Prof. Moraes Rego, 1235, Cidade Universitaria, Recife, PE, 50670-901, Brazil

    Gelsoneide da Silva Gois & Yeda Medeiros Bastos Almeida

  2. Department of Materials Engineering, Federal University of Paraiba—UFPB, Cidade Universitaria, s/n Castelo Branco, João Pessoa, Paraíba, PB, 58051-900, Brazil

    Amélia Severino Ferreira Santos & Eliton Souto Medeiros

  3. Department of Physiscs, Federal University of Pernambuco—UFPE, Av. Prof. Moraes Rego, 1235, Cidade Universitaria, Recife, PE, 50670-901, Brazil

    Eduardo Padrón Hernandéz

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  1. Gelsoneide da Silva Gois
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  2. Amélia Severino Ferreira Santos
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  3. Eduardo Padrón Hernandéz
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  4. Eliton Souto Medeiros
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  5. Yeda Medeiros Bastos Almeida
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Correspondence to Amélia Severino Ferreira Santos.

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Gois, G., Santos, A., Hernandéz, E. et al. Biodegradation of PLA/CNC composite modified with non-ionic surfactants. Polym. Bull. 80, 11363–11377 (2023). https://doi.org/10.1007/s00289-022-04618-z

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  • DOI: https://doi.org/10.1007/s00289-022-04618-z

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