Version 1
: Received: 25 July 2023 / Approved: 26 July 2023 / Online: 26 July 2023 (10:17:36 CEST)
How to cite:
Arshanitsa, A.; Lauberts, M.; Pals, M.; Ponomarenko, J. Dissolution Behaviour of Bark Extractives in Polyurethane Synthesis Media: A Comprehensive Study. Preprints2023, 2023071753. https://doi.org/10.20944/preprints202307.1753.v1
Arshanitsa, A.; Lauberts, M.; Pals, M.; Ponomarenko, J. Dissolution Behaviour of Bark Extractives in Polyurethane Synthesis Media: A Comprehensive Study. Preprints 2023, 2023071753. https://doi.org/10.20944/preprints202307.1753.v1
Arshanitsa, A.; Lauberts, M.; Pals, M.; Ponomarenko, J. Dissolution Behaviour of Bark Extractives in Polyurethane Synthesis Media: A Comprehensive Study. Preprints2023, 2023071753. https://doi.org/10.20944/preprints202307.1753.v1
APA Style
Arshanitsa, A., Lauberts, M., Pals, M., & Ponomarenko, J. (2023). Dissolution Behaviour of Bark Extractives in Polyurethane Synthesis Media: A Comprehensive Study. Preprints. https://doi.org/10.20944/preprints202307.1753.v1
Chicago/Turabian Style
Arshanitsa, A., Matiss Pals and Jevgenija Ponomarenko. 2023 "Dissolution Behaviour of Bark Extractives in Polyurethane Synthesis Media: A Comprehensive Study" Preprints. https://doi.org/10.20944/preprints202307.1753.v1
Abstract
The production of polyurethane films from bark-derived polyols requires the complete solubility of all components in the polyurethane synthesis media. In this study, a comprehensive investigation was conducted to achieve the copolymerization of black alder bark water extract-derived polyol with isocyanate for polyurethane film synthesis in THF solution. A fractionation approach using tetrahydrofuran (THF) as a solvent was employed to dissolve the extract, followed by filtration and removal of the solvent. The resulting THF-soluble fraction comprised 62±1% of the dry weight of the alder bark extract, mainly consisting of the xyloside form of the diarylheptanoid compound oregonin, along with oligomeric flavonoids and carbohydrates. The THF-insoluble fraction was the most enriched with carbohydrate compounds, followed by the crude extract and THF-soluble fraction. Another approach was aimed at obtaining bark extractives based liquid polyols suitable for producing rigid PU foams. For this purpose, oven-dried crude black alder bark water extract was liquefied with polyethylene glycol (PEG 400). The liquefaction of black alder bark and pine bark extractives was studied under different conditions, including varying temperature ranges (130-170⁰C), catalyst concentrations (0-1,5%), and bark extract content in the mixture (15-30%). The results showed that the use of sulphuric acid as a catalyst (1-1.5%) significantly improved the solubility of both extractives, enabling the attainment of extract concentrations up to 25% at 170⁰C. However, increasing the extract content beyond a certain threshold led to incomplete solubility. It was shown that the PEG-insoluble fractions consist mainly of carbohydrate components. To increase the content of biomass in liquid polyols, the effect of glycerol additions into the liquefaction agent is under study. The findings provide insights into tailoring bark-sourced polyols for polyurethane foam production through appropriate liquefaction conditions.
Chemistry and Materials Science, Polymers and Plastics
Copyright:
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
