VEGETABLE OIL-BASED HYPERBRANCHED POLYOLS IN FLEXIBLE FOAMS
DOI:
https://doi.org/10.7251/COM1201063PAbstract
Novel polyols were synthesized by controlled polymerization of hydroxylated fatty acids from methyl soyate. Polymerization of methyl esters of hydroxy fatty acids gives a hyperbranched (HB) product with different content of hydroxyl groups depending on the degree of conversion. Molecular weights, functionality and hydroxyl equivalent of polyols can be controlled by controlling the degree of conversion but also using monofunctional components. A range of hyperbranched polyols with acceptable viscosities and functionalities, suitable for flexible applications, was obtained by stopping the reaction at different degrees of conversion. A polyol with 60% of hydroxylated soybean fatty acid methyl esters and 40% of methyl esters from castor oil was selected for detailed analysis and was used in flexible foams. Monte-Carlo simulation of the polymerization of hydroxylated methyl soyate gave molecular weights and distributions which were compared with experimental values. Flexible foams were obtained with 65% of HB polyol in a mixture with a petrochemical triol. Increasing concentration of the HB polyol improved load bearing properties but decreased mechanical strengths and in particular tear strength.References
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[2] Petrović, Z.; Guo, A.; Javni, I. US Pat. 6,107,433, 2000.
[3] Petrović, Z.; Javni, I.; Guo, A.; Zhang, W. US Pat. 6,433,121, 2002.
[4] Höfer, R. In Oleochemical polyols - New Raw Materials for Polyurethane Applications, Proceedings European Coatings Conference, Berlin, 1999; Berlin, 1999.
[5]Ionescu, M., Chemistry and Technology of Polyols for Polyurethanes. Rapra Technology, Ltd.: Shawbury, Shrewsburty, Shropshire, UK, 2005.
[6] Narine, S. S.; Kong, X.; Bouzidi, L.; Sporns, P., J Amer Oil Chem Soc 2007, 84, 55-63.
[7] Shaari, N. Z. K.; Lye, O. T.; Ahmad, S., Journal of Oil Palm research 2004, 16, (1), 66-71.
[8] Petrović, Z. S.; Yang, L.; Zlatanić A.; Zhang, W.; Javni, I., J.Appl.Polym.Sci. 2007.
[9] Petrović, Z. S.; Guo, A.; Javni, I.; Cvetković, I.; Hong, D. P., Polymer International 2008, 57, (2), 275-281.
[10] Voit, B. I.; Lederer, A., Chem. Rev. 2009, 109, 5924-5973.
[11] Dušek, K.; Duskova-Smrckova, M., Formation, structure and properties of the crosslinked state in relation to precursor architecture. In Dendritic Polymers, Tomalia, D. A.; Frechet, E. J. M. J., Eds. Wiley-VCH:: Weinheim, 2002; pp 111-145.
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[15] Painter, P. C.; Coleman, M. M., Fundamentals of Polymer Science. 2nd ed.; Technomic Publishing Co., Inc.: Lancaster, PA 17604, USA, 1997; p 104.
[16] Herrington, R., Flexible Polyurethane Foams. 2nd ed.; The Dow Chemical Co.: Middland, MI, 1997.
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2012-10-19
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