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Preparation and characterization of biodegradable cellulose acetate-based films with novel plasticizer obtained by polyethylene terephthalate glycolysis intended for active packaging

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Abstract

An active packaging based on the composite film was developed by incorporation of oregano oil as an antimicrobial agent into a cellulose acetate/polycaprolactone diol blend (CA/PCL-diol). A novel plasticizer based on polyethylene terephthalate (PET) glycolysis product (bis(hydroxyethyl terephthalate)) and tartaric acid was synthesized and its influence on the structural, surface, mechanical, barrier, and thermal properties were investigated. The obtained results have shown that plasticizer also has a compatibilizing effect, improving the miscibility of polymers in a blend. A sample with the optimal amount of plasticizer (30 wt%), as well as the best mechanical and barrier properties, was used for the preparation of series with different amounts of oregano oil (3, 6, and 9 wt%). The synthesized azo dye—5-(4-bromo-phenyl azo)-3-amido-6-hydroxy-4-methyl-2-pyridone, soluble in acetone, as well as a blend and plasticizer, has been shown as an adequate one for this composition, due to its ability to achieve a good pigmentation in a low amount (0.3 wt% per polymer blend weight), to absorb UV light, and decrease the aging of the material. Contemporary lifestyle has imposed a need for ready-to-eat (RTE) meals which saves consumers time. RTE food packaging should meet certain requirements such as the ability to prolong shelf-life and preserve the freshness of the food product, and at the same time to make a minimal amount of waste after usage, considering the fact that it is mostly single-use plastic food packaging. Optimal mechanical properties, biodegradability, and additional functions make these films suitable for the packaging of ready-to-eat (RTE) food such as fresh salad.

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Data availability

The datasets generated during and/or analyzed during the current study are available from the corresponding author on reasonable request.

Abbreviations

PET:

Polyethylene terephthalate

CA:

Cellulose acetate

PCL-diol:

Polycaprolactone diol

BHET:

Bis(2-hydroxyethyl) terephthalate

TA:

Tartaric acid

GTT:

Glycerol tritartarate

BHETTA:

Bis(2-hydroxyethyl) terephthalate/tartaric acid-based ester

EB:

Elongation at break

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Acknowledgments

The authors thank the Ministry of Science, Technological Development and Innovation, Republic of Serbia, Project Number 451-03-47/2023-01/200134 and Provincial Secretariat for Higher Education and Scientific Research of AP Vojvodina [142-451-3106/20222-01].

Funding

All expenses (chemical analysis, materials) were funded by ourselves and funds provided by the Ministry of Science, Technological Development and Innovation, Republic of Serbia, and Provincial Secretariat for Higher Education and Scientific Research of AP, Republic of Serbia.

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The manuscript was written through the contributions of all authors. All authors have approved the final version of the manuscript.

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Correspondence to Tamara Erceg.

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Erceg, T., Vukić, N., Šovljanski, O. et al. Preparation and characterization of biodegradable cellulose acetate-based films with novel plasticizer obtained by polyethylene terephthalate glycolysis intended for active packaging. Cellulose 30, 5825–5844 (2023). https://doi.org/10.1007/s10570-023-05240-6

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  • DOI: https://doi.org/10.1007/s10570-023-05240-6

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