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. 2020 Dec 12;13(24):5673.
doi: 10.3390/ma13245673.

Thermal Insulation and Sound Absorption Properties of Open-Cell Polyurethane Foams Modified with Bio-Polyol Based on Used Cooking Oil

Maria Kurańska  1 , Roman Barczewski  2 , Mateusz Barczewski  3 , Aleksander Prociak  1 , Krzysztof Polaczek  1
Affiliations

Thermal Insulation and Sound Absorption Properties of Open-Cell Polyurethane Foams Modified with Bio-Polyol Based on Used Cooking Oil

Maria Kurańska et al. Materials (Basel). .

Abstract

The main goal of this work was to evaluate the thermal insulation and sound absorption properties of open-cell rigid polyurethane foams synthesized with different contents of cooking oil-based polyol. The content of the applied bio-polyol as well as flame retardant (triethyl phosphate) in the foam formulation had a significant influence on the cellular structures of the materials. The open-cell polyurethane foams were characterized by apparent densities in the range 16-30 kg/m3. The sound absorption coefficients of the polyurethanes with various contents of bio-polyol were determined using the standing wave method (Kundt's tube) in the frequency range of 100-6300 Hz. The effect of the content of the bio-polyol and flame retardant on the coefficient of thermal conductivity (at average temperatures of 0, 10 and 20 °C) as well as the compressive strength (at 20 and -10 °C) was analyzed. Different trends were observed in terms of the thermal insulation properties and sound absorption ability of the open-cell polyurethanes due to the addition of bio-polyol. In conclusion, it is necessary to use systems containing both petrochemical and bio-based raw materials.

Keywords: bio-polyol; circular economy; open-cell polyurethane foams; sound absorption properties; thermal insulation.

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Conflict of interest statement

The authors declare no conflict of interest.

Figures

Figure 1
Figure 1
Photographs of 100 mm-diameter polyurethane (PUR) samples used for acoustic properties evaluation in the frequency range of 100–1000 Hz.
Figure 2
Figure 2
Diagram depicting measurement system used to determine sound absorption coefficients.
Figure 3
Figure 3
Cellular structure of foams modified with bio-polyol: (a) cross-section of the area parallel to foaming direction (b) cross-section of the area perpendicular to foaming direction.
Figure 4
Figure 4
Influence of bio-polyol (a) and both bio-polyol and flame retardant (b) on compressive strength of open-cell PUR foams.
Figure 5
Figure 5
Normalized compression strength of PUR foams modified with bio-polyol (a) and bio-polyol and flame retardant (b).
Figure 6
Figure 6
Sound absorption coefficients of OPU PUR foams.
Figure 7
Figure 7
Sound absorption coefficients of FR_OPU PUR foams.
Figure 8
Figure 8
Average sound absorption coefficients of selected polyurethane foams in different frequency ranges.
See this image and copyright information in PMC

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