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Impact of Suberin Depolymerization Conditions on the Thermal Properties and Flammability of Rigid Polyurethane Foams.

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Title: Impact of Suberin Depolymerization Conditions on the Thermal Properties and Flammability of Rigid Polyurethane Foams.
Authors: Ivdre, Aiga1 (AUTHOR), Kirpluks, Mikelis1 (AUTHOR) mikelis.kirpluks@kki.lv, Godina, Daniela1 (AUTHOR), Abolins, Arnis1 (AUTHOR), Vevere, Laima1 (AUTHOR), Berzins, Rudolfs1 (AUTHOR), Lauberts, Maris1 (AUTHOR), Rizikovs, Janis1 (AUTHOR)
Source: Polymers (20734360). Jun2026, Vol. 18 Issue 11, p1355. 20p.
Subjects: Depolymerization, Thermal properties, Flammability, Polyols, Mechanical behavior of materials, Urethane foam
Abstract: Suberinic acids (SA) derived from birch outer bark are renewable feedstocks for bio-based polyols suitable for rigid polyurethane (PU) foams. Three SA fractions were prepared under different depolymerization conditions: acidification at pH 1 (SA1), pH 5 (SA2), and FeCl3-assisted treatment (SA3), and their chemical composition was analysed by GC–MS, Py–GC/MS, and GPC–RID. Polyols derived from tall oil fatty acids (TOFA) or epoxidized TOFA with trimethylolpropane were used as the sole polyol components in foam formulations. The SA fractions differed in molecular weight distribution, affecting polyol processability. All foams exhibited similar limiting oxygen index (19–20) and cone calorimetry results, showing no statistically significant differences in flammability. This indicates that variations in depolymerization conditions, including polyphenolic content and removal of higher-molecular-weight fractions during FeCl3 treatment, do not dominate fire performance under the studied conditions. SA3-based polyols showed the lowest viscosity and produced foams with optimal mechanical and thermal properties, while SA1 offered higher yield with comparable performance. These results demonstrate the feasibility of converting SA fractions into functional polyols for rigid PU foams and highlight the FeCl3-treated SA3 fraction and SA1 as the most promising candidates for further development. [ABSTRACT FROM AUTHOR]
Copyright of Polymers (20734360) is the property of MDPI and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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DbLabel: Engineering Source
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  Data: Impact of Suberin Depolymerization Conditions on the Thermal Properties and Flammability of Rigid Polyurethane Foams.
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  Data: <searchLink fieldCode="AR" term="%22Ivdre%2C+Aiga%22">Ivdre, Aiga</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Kirpluks%2C+Mikelis%22">Kirpluks, Mikelis</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> mikelis.kirpluks@kki.lv</i><br /><searchLink fieldCode="AR" term="%22Godina%2C+Daniela%22">Godina, Daniela</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Abolins%2C+Arnis%22">Abolins, Arnis</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Vevere%2C+Laima%22">Vevere, Laima</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Berzins%2C+Rudolfs%22">Berzins, Rudolfs</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Lauberts%2C+Maris%22">Lauberts, Maris</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Rizikovs%2C+Janis%22">Rizikovs, Janis</searchLink><relatesTo>1</relatesTo> (AUTHOR)
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  Data: <searchLink fieldCode="JN" term="%22Polymers+%2820734360%29%22">Polymers (20734360)</searchLink>. Jun2026, Vol. 18 Issue 11, p1355. 20p.
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  Data: <searchLink fieldCode="DE" term="%22Depolymerization%22">Depolymerization</searchLink><br /><searchLink fieldCode="DE" term="%22Thermal+properties%22">Thermal properties</searchLink><br /><searchLink fieldCode="DE" term="%22Flammability%22">Flammability</searchLink><br /><searchLink fieldCode="DE" term="%22Polyols%22">Polyols</searchLink><br /><searchLink fieldCode="DE" term="%22Mechanical+behavior+of+materials%22">Mechanical behavior of materials</searchLink><br /><searchLink fieldCode="DE" term="%22Urethane+foam%22">Urethane foam</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: Suberinic acids (SA) derived from birch outer bark are renewable feedstocks for bio-based polyols suitable for rigid polyurethane (PU) foams. Three SA fractions were prepared under different depolymerization conditions: acidification at pH 1 (SA1), pH 5 (SA2), and FeCl3-assisted treatment (SA3), and their chemical composition was analysed by GC–MS, Py–GC/MS, and GPC–RID. Polyols derived from tall oil fatty acids (TOFA) or epoxidized TOFA with trimethylolpropane were used as the sole polyol components in foam formulations. The SA fractions differed in molecular weight distribution, affecting polyol processability. All foams exhibited similar limiting oxygen index (19–20) and cone calorimetry results, showing no statistically significant differences in flammability. This indicates that variations in depolymerization conditions, including polyphenolic content and removal of higher-molecular-weight fractions during FeCl3 treatment, do not dominate fire performance under the studied conditions. SA3-based polyols showed the lowest viscosity and produced foams with optimal mechanical and thermal properties, while SA1 offered higher yield with comparable performance. These results demonstrate the feasibility of converting SA fractions into functional polyols for rigid PU foams and highlight the FeCl3-treated SA3 fraction and SA1 as the most promising candidates for further development. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Polymers (20734360) is the property of MDPI and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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        Value: 10.3390/polym18111355
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        Text: English
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        PageCount: 20
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      – SubjectFull: Depolymerization
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      – SubjectFull: Thermal properties
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      – SubjectFull: Flammability
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      – SubjectFull: Polyols
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      – SubjectFull: Mechanical behavior of materials
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      – SubjectFull: Urethane foam
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    Titles:
      – TitleFull: Impact of Suberin Depolymerization Conditions on the Thermal Properties and Flammability of Rigid Polyurethane Foams.
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            – D: 01
              M: 06
              Text: Jun2026
              Type: published
              Y: 2026
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