Properties of Rigid Polyurethane Foam Filled with Sawdust from Primary Wood Processing

Dukarska, Dorota; Walkiewicz, Joanna; Derkowski, Adam; Mirski, Radosław

doi:10.3390/ma15155361

Cited by 21 publications

(11 citation statements)

References 68 publications

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“…Członka et al [ 45 ] reported that cracks could be caused by the agglomeration of the fillers. A similar effect was also observed in the research on rigid foams [ 26 ].…”

Section: Resultssupporting

confidence: 86%

“…Sung and Kim [ 25 ] found that smaller pore sizes resulted in a smaller distance between the cell walls; thus, the resistance to deformation under the external force increased with the decrease in the size of the cells. The addition of fillers to the PUR causes a reduction in cell-wall thickness, which was reflected in the strength test results of the foams [ 26 ].…”

Section: Introductionmentioning

confidence: 99%

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Morphological Features of PUR-Wood Particle Composite Foams

et al. 2022

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The aim of this study was to apply waste wood particles (WP) with different sizes from primary wood processing as a filler for open-cell PUR foams. For this purpose, various wood particle sizes were added as a filler for polyurethane foams (PUR). The effects of the addition of 0.05≤0.125 mm, 0.125≤0.315 mm, 0.315–1.25 mm , and >1.25–2.0 mm of WP to the polyurethane matrix on the density, the kinetics of PUR foaming, the cell structure, and the morphology were investigated. Scanning electron microscope (SEM) and X-ray computer tomography were used. Based on the results, it was found that the addition of WP in the amount of 10% leads to an increase in density with an increase in particle size. The research shows that the morphology of the PUR-WP foam is influenced by its particle size. The difference in the number and size of cells in PUR-WP composites depends on the wood particle size. The addition of dust causes the formation of cells of much smaller sizes; confirmed by SEM images. Moreover, computer tomography clearly demonstrates that the WP are well-dispersed within the foams’ structures.

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“…Członka et al [ 45 ] reported that cracks could be caused by the agglomeration of the fillers. A similar effect was also observed in the research on rigid foams [ 26 ].…”

Section: Resultssupporting

confidence: 86%

Section: Introductionmentioning

confidence: 99%

Morphological Features of PUR-Wood Particle Composite Foams

et al. 2022

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“…The PUR industry is no exception, and this has encouraged scientists and manufacturers globally to develop and produce composite foams from renewable feedstocks, more specifically isocyanates from fatty/amino acids [ 7 ], polyols from non-edible and edible natural oils [ 8 , 9 ] and natural fillers [ 10 , 11 ]. These natural or bio-based materials reduce greenhouse gas emissions and increase environmental conservation and sustainability, and importantly, are a cost-efficient way to develop and produce PUR composites.…”

Section: Introductionmentioning

confidence: 99%

Impact of Sunflower Press Cake and Its Modification with Liquid Glass on Polyurethane Foam Composites: Thermal Stability, Ignitability, and Fire Resistance

et al. 2022

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Polyurethane (PUR) foams are some of the most promising thermal insulating materials because of their high flammability, but further applications are limited. Therefore, the development of flame-retardant materials with sufficient strength characteristics, water resistance, and low thermal insulating properties is of great importance to the modern building industry. This study evaluates the possibility of a vacuum-based liquid glass (LG) infusion into bio-based fillers, in this case, sunflower press cake (SFP) particles, to improve the mechanical performance, water absorption, thermal insulation, ignitability, thermal stability, and flame retardancy of the resulting polyurethane (PUR) foam composites. The main findings show that LG slightly improves the thermal stability and highly contributes to the ignitability and flame retardancy of the resulting products. Most importantly, from 10 wt.% to 30 wt.%, the SFP/LG filler reduces the thermal conductivity and water absorption values by up to 20% and 50%, respectively, and increases the compressive strength by up to 110%. The results obtained indicate that the proposed SFP/LG filler-modified PUR foam composites are suitable for applications as thermal insulation materials in building structures.

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“…To date, there have been few studies analysing the impact of fillers on the dimensional stability of bioPUR foams [ 41 , 42 , 43 ] which were synthesised using the system of lower- and higher-functionality polyols. Although the changes in linear dimensions under ambient temperature are not favourable, the sufficient operation in higher temperature and humidity conditions must be validated as well.…”

Section: Resultsmentioning

confidence: 99%

Impact of Different Ratios of Lignin Waste and Liquid Glass on the Performance Characteristics of Biopolyurethane Foams

et al. 2023

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In the current study, biopolyurethane foam was modified with 2.5–10 wt.% lignin waste (LigW) and liquid glass (LG)-modified LigW particles at different LigW/LG ratios—1:1 and 1:2—and their impact on performance characteristics—i.e., rheology, foaming times, apparent density, thermal conductivity before and after aging, dimensional stability at ambient and elevated conditions, compressive and tensile strengths, short-term water absorption by partial immersion, and water vapor permeability—was determined and evaluated. Structural analysis was implemented and structural parameters were taken into consideration as well. During the study, it was determined that 2.5–10 wt.% particles at the LigW/LG ratio of 1:2 showed a superior impact on the physical and mechanical properties of bioPUR foams. The apparent density only insignificantly increased and was in a density range suitable for commercially available polyurethanes. For particles at 10 wt.% and LigW/LG ratio of 1:1, the thermal conductivity value improved by 3.2%, the compressive strength increased by 153%, while the tensile strength improved by 23.5%, indicating sufficient interfacial adhesion between the filler and polymer matrix. Moreover, the short-term water absorption by partial immersion remained almost unchanged, while the water vapour diffusion resistance factor improved from 43 to 48. Additionally, the incorporation of LigW/LG 1:1 and LigW/LG 1:2 particles made it possible to obtain dimensionally and structurally stable closed-cell bioPUR foams for possible application as thermal insulation in building envelopes.

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Properties of Rigid Polyurethane Foam Filled with Sawdust from Primary Wood Processing

Cited by 21 publications

References 68 publications

Morphological Features of PUR-Wood Particle Composite Foams

Morphological Features of PUR-Wood Particle Composite Foams

Impact of Sunflower Press Cake and Its Modification with Liquid Glass on Polyurethane Foam Composites: Thermal Stability, Ignitability, and Fire Resistance

Impact of Different Ratios of Lignin Waste and Liquid Glass on the Performance Characteristics of Biopolyurethane Foams

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