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Types of Step-Growth Polymers: Polyesters01:20

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The introduction of polyesters has brought major development to the textile industry. The wrinkle-free behavior of polyester blends has eliminated the need for starching and ironing clothes.
Polyesters are commonly prepared from terephthalic acid and ethylene glycol; the crude product is known as poly(ethylene terephthalate) or PET. However, polyesters are synthesized industrially by transesterification of dimethyl terephthalate with ethylene glycol at 150 °C. The two reactants and the...
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TAPE: A Biodegradable Hemostatic Glue Inspired by a Ubiquitous Compound in Plants for Surgical Application
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Fully Biobased Polyhydroxyalkanoate/Tannin Films as Multifunctional Materials for Smart Food Packaging Applications.

Martina Ferri1,2, Kseniya Papchenko3, Micaela Degli Esposti1,2

  • 1Department of Civil, Chemical, Environmental and Materials Engineering (DICAM), University of Bologna, Via Terracini 28, 40131 Bologna, Italy.

ACS Applied Materials & Interfaces
|June 2, 2023
PubMed
Summary

This study introduces a new food packaging material made from poly(hydroxybutyrate-co-valerate) (PHBV) and tannins. The innovative bioplastic enhances food preservation and acts as a smart indicator for spoilage, offering a sustainable alternative to traditional plastics.

Keywords:
active packagingbiobased additivebiodegradable polymerfood packagingpolyhydroxyalkanoatessmart packagingtannins

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Food Science

Background:

  • Growing demand for sustainable food packaging solutions to mitigate environmental impact.
  • Need for functionalized biodegradable materials that extend shelf-life and monitor food quality.
  • Limitations of fossil-based plastics and the potential of biobased alternatives.

Purpose of the Study:

  • To develop and characterize an innovative bioplastic formulation for food packaging using poly(hydroxybutyrate-co-valerate) (PHBV) and tannins.
  • To evaluate the impact of tannins on the physical, chemical, and barrier properties of PHBV films.
  • To assess the potential of the developed material as a smart indicator for food spoilage.

Main Methods:

  • Preparation of PHBV/tannin films via solvent casting using formic acid for homogeneous dispersion.
  • Characterization of film properties including antioxidant activity, UV protection, gas barrier, thermal stability (DSC), and mechanical strength (tensile tests).
  • Evaluation of the material's response to ammonia vapors for spoilage detection.

Main Results:

  • PHBV/tannin films exhibited enhanced antioxidant, UV protection, and gas barrier properties, with optimal performance at 5 phr tannin content.
  • The films maintained good transparency and demonstrated thermal stability suitable for a wide temperature range (refrigeration to 200 °C).
  • Mechanical properties (Young's modulus and tensile strength) were comparable to conventional packaging polymers. The material colorimetrically detected ammonia, indicating spoilage.

Conclusions:

  • Tannins effectively impart multifunctional properties to PHBV, creating a promising bioplastic for advanced food packaging.
  • The developed PHBV/tannin material offers improved food preservation and spoilage indication capabilities.
  • This innovation presents a viable, eco-friendly alternative to petroleum-based plastics for smart food packaging applications.