Biobased Polyurethanes from Rapeseed Oil Polyols: Structure, Mechanical and Thermal Properties
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Biobased polyols were synthesized from rapeseed oil (RO) with diethanolamine (DEA), triethanolamine (TEA) and glycerol (GL) at different molar ratios. The structures of the synthesized polyols were analyzed using FTIR-ATR spectroscopy. Polyurethane (PU) networks from RO/DEA polyols and polymeric MDI showed higher tensile strength, modulus and hardness, but their elongation at break decreased, compared to the case of the PU obtained from RO/TEA and RO/GL polyols. The tensile strength and modulus of PU networks increased with increasing PU cohesion energy density (CED) and decreasing molecular weight between crosslinks M c . From the thermogravimetric analysis and its derivative thermograms, at the first stage of destruction (below 5 % weight loss) in the air and inert atmosphere, the PU obtained from RO polyols were ranked in the following order: PU RO/GL > PU RO/TEA > PU RO/DEA, and their thermostability was higher than that of the PU based on propylene oxide.
KeywordsRapeseed oil polyols Polyurethane networks Mechanical properties Thermal properties Cohesion energy density
The work has been financed by the European Regional Development Fund Contract No 2010/0214/2DP/22.214.171.124.0/10/APIA/VIAA/054.
- 12.Stirna U, Lazdina B, Vilsone Dz, Deme L, Yakushin V, Lopez MJ, Vargas-Garcia MC, Suarez-Estrella F, Moreno J (2011) Structure and properties of the polyurethane and polyurethane foam synthesized from castor oil polyols. In: Proceedings of the 3th international conference of Biofoams, Italy, 255–261Google Scholar
- 15.Wolf P, Farum Larsen H (1972) Polyurethane prepared from glycerin reaction products. USP 3(637):539Google Scholar
- 17.Lee CS, Lee SC (2010) Characterization of epoxidation and non–epoxidized fatty diethanolamides by high performance liquid chromatography and gas chromatography. Am J Pharm Techn 5(3):133–138Google Scholar
- 22.David DJ, Stanley MP (1974) Analytical chemistry of polyurethane, part III: high polymers. Wiley Interscience, New York, pp 16–365Google Scholar