Abstract
Rigid polyurethane foams of significant renewable content (up to 50%) were produced using biomass biopolyols obtained previously via crude-glycerol mediated solvothermal liquefaction of three industrial biomass residue feedstocks: digested sewage sludge, hemp stalk hurds and sugar beet pulp (DSS, HSH and SBP), and commercial diphenylmethane diisocyanate. The produced foams exhibited higher apparent densities 43–160 kg/m3 and compressive strengths 34–254 kPa compared to tested commercial analogues. Varying foam formulation isocyanate-to-hydroxyl group ratios and blending biomass biopolyols with blank crude glycerol biopolyols led to lighter and less strong products. Blank crude glycerol and DSS biopolyol foams exhibited slowest water absorption rates. Biopolyol foams exhibited higher thermal stability and the non-flame retarded foams showed lower potential for fire spread due to lower pyrolysis gas combustion heat release rates and total released amounts of heat. In terms of fire toxicity, biopolyol foams are suspected to be slightly less toxic than typical commercial PU rigid foams (CO and HCN yields of 172.2 and 6.19 mg/g, respectively), still generating significant amounts of irritant smoke in under-ventilated flaming fire scenarios. The products were stable dimensionally (below 1% elongation) and moderately biodegradable (specific rates of 0.25–0.53%/month). Overall, the foams produced show promise as sustainable alternatives in applications such as domestic construction filler foams, where low density is not crucial but fire safety is of utmost importance.
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Acknowledgements
The authors thank UAB Mestilla, AB Nordic Sugar Kedainiai, UAB Kauno Vandenys and Endoca ApS for providing the CG, SBP, DSS and HSH, respectively. Moreover, gratitude is also expressed to Evonik for providing the foaming catalyst and surfactant. LJ thanks the research groups at the Laboratory of Biodeterioration Research of the Nature Research Centre (Lithuania) and the Centre for Fire and Hazard Science (UK) for collaborating in this study. This research did not receive any specific grant from funding agencies in the public, commercial, or not-for-profit sectors. Finally, the authors declare no competing financial interests.
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Jasiūnas, L., McKenna, S.T., Bridžiuvienė, D. et al. Mechanical, Thermal Properties and Stability of Rigid Polyurethane Foams Produced with Crude-Glycerol Derived Biomass Biopolyols. J Polym Environ 28, 1378–1389 (2020). https://doi.org/10.1007/s10924-020-01686-y
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DOI: https://doi.org/10.1007/s10924-020-01686-y