Biobased Polyurethanes from Rapeseed Oil Polyols: Structure, Mechanical and Thermal Properties |
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Authors: | Uldis Stirna Anda Fridrihsone Brigita Lazdi?a Marija Misāne Dzintra Vilsone |
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Institution: | 1. Polymer Laboratory, Latvian State Institute of Wood Chemistry, 27 Dzerbenes Str., Riga, LV, 1006, Latvia
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Abstract: | 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. |
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