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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Lignin is a complex chemical structured polymer naturally existing, originating in plants and trees. Plant tissues as binding the cells, fibres and vessels have them in abundance. It is the main constituent in wood. Lignin is world’s second largest renewable carbon source after cellulose. Black and red liquor account for major sources from where lignin occurs. Lignin is the only recognized natural biological aromatic polymer in this world.Economically, it is extensively used as niche application which has low volume. Potential uses of lignin for environmental benefits are replacement for fossil based raw materials, an effective alternative for plastic, bio-based alternative topetroleum, etc.
Lignosulfonates are water soluble ionic polyelectrolyte polymers and are by products from the production of wood pulp. Lignosulfonates have a variety of applications ranging from plasticizers to dispersing pesticides. Vanilla flavour, a term that we often hear is produced by the oxidation of lignosulfonates. From the industry perspective oil and gas industry find huge use of lignosulfonates.
Kraft Lignin is an emerging product of lignin. It covers a wide range of applications and primarily used in activated carbon, carbon fibres, phenolic resins and many other engineering applications. Due to its scope in manufacturing aromatic macro molecules kraft lignin is emerging as the fastest growing component of lignin market.
Organosolv lignin is lignin obtained from organosolv process. Having advantages like easy recovery, and higher yield (around 4%-5%) than kraft lignin process from the pulp production perspective organosolv lignin finds tremendous use. Pulp production and fuel ethanol production are the two major areas of application of organosolv lignin.
Cool post!