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Rigid Polyurethane Biofoams Filled with Chemically Compatible Fruit Peels.

Andrey Pereira Acosta1, Caio Gomide Otoni2, André Luiz Missio3

  • 1Postgraduate Program in Mining, Metallurgical and Materials Engineering, Federal University of Rio Grande do Sul, Porto Alegre 91509-900, Brazil.

Polymers
|November 11, 2022
PubMed
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Banana and bergamot peels can be used as fillers to create rigid polyurethane foam (RPUF) composites. These RPUF composites show improved thermal stability and cell size with up to 15% peel content.

Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Sustainable Materials

Background:

  • Fruit peels, like banana and bergamot, are abundant agricultural byproducts.
  • Underutilization of these peels represents a loss of valuable resources.
  • Developing novel applications for fruit peels can promote a circular economy.

Purpose of the Study:

  • To develop rigid polyurethane foam (RPUF) composites using banana and bergamot peels as fillers.
  • To investigate the impact of these natural fillers on RPUF properties.
  • To assess the feasibility of using fruit peels as sustainable alternatives in composite materials.

Main Methods:

  • Characterization of polysaccharide-rich fruit peel fillers using wet analyses.
  • Fabrication of RPUF composites with varying filler content (up to 15%).
Keywords:
banana peelbergamot peelfood wastereinforced expansive foam

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  • Evaluation of morphological, thermal, mechanical, hygroscopic, and colorimetric properties of the RPUF composites.

    • Main Results:

    • RPUF composites with up to 15% filler content exhibited comparable water uptake, apparent density, and compressive strength to neat RPUF.
    • Significant improvements were observed in thermal stability (up to 115% increase).
    • An increase in cell size (up to 80%) was noted with the addition of fruit peel fillers.

    Conclusions:

    • Banana and bergamot peels are viable fillers for RPUF composite development.
    • The addition of these peels enhances thermal stability without compromising key mechanical and physical properties.
    • This research offers a sustainable pathway for valorizing fruit processing byproducts into functional materials.