Scientists from University of Strasbourg, France, published results of their recent research on Bio based building blocks for segmented Polyurethanes. A macropolyol was prepared by combining two different biomolecules- lignin and oleic acid, from biomass. NMR and FT-IR analyses are performed to determine the chemical structure of the lignic- fatty acid based polyol. Polyurethanes preolymers are synthesised from 4,4′-methylenebis(phenyl isocyanate) and poly(propylene)glycol of different molecular weights (PPG – 425, 1000 and 2000 g mol−1. ).
On varying the reaction parameters, in the presence of lignin- fattyacid based macropolyol, different PU macromolecular architectures were obtained. The chemical structure of the lignin- based polyurethane was analysed by FT-IR, and the properties of polymers by DSC, TGA, DMTA, and tensile test experiments. Thus obtained new polymers is found to posses advanced properties and may serve as an optimal alternative to conventional polyurethanes. Full Article
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