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Three-Dimensional Characterization of Polyurethane Foams Based on Biopolyols.

Lorenleyn De la Hoz Alford1,2, Camila Gomes Peçanha de Souza1, Sidnei Paciornik1

  • 1Department of Chemical and Materials Engineering, Pontifical Catholic University of Rio de Janeiro (PUC-Rio), Rio de Janeiro 22451-900, RJ, Brazil.

Materials (Basel, Switzerland)
|March 11, 2023
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Summary

This study characterized biopolyol-based foams from banana leaves and stems, revealing distinct microstructures and compression behaviors. The developed X-ray microtomography method aids in developing green foam alternatives.

Keywords:
3D microstructureX-ray microtomographybananabiopolyolcompression mechanical

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Area of Science:

  • Materials Science
  • Biomaterials Engineering
  • Polymer Science

Background:

  • Biopolyol-based foams offer sustainable alternatives to petroleum-based foams.
  • Characterizing the mechanical behavior and microstructure of these novel foams is crucial for their application.

Purpose of the Study:

  • To produce and characterize biopolyol-based foams from banana leaves (BL) and stems (BS).
  • To investigate the compression mechanical behavior and 3D microstructure of these foams.
  • To develop and validate a methodology for analyzing foam microstructure during compression.

Main Methods:

  • Production of biopolyol-based foams from banana leaves and stems.
  • In situ compression testing combined with X-ray microtomography for 3D image acquisition.
  • Development of image processing and analysis techniques to quantify cell characteristics (number, volume, shape) during compression.

Main Results:

  • Both BL and BS foams exhibited similar compression behaviors.
  • Banana stem (BS) foam had an average cell volume five times larger than banana leaf (BL) foam.
  • Cellular structure analysis showed an increase in cell number and a decrease in average cell volume with compression, with elongated cell shapes.

Conclusions:

  • The developed methodology enables detailed analysis of biopolyol-based foam microstructures under compression.
  • The findings suggest cell collapse as a key factor influencing foam behavior.
  • These banana-derived foams show potential as eco-friendly alternatives to conventional petroleum-based foams.