Production and characterization of rigid polyurethane foam by oxypropylation of organosolv lignin extracted from exhaust
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ORIGINAL PAPER
Production and characterization of rigid polyurethane foam by oxypropylation of organosolv lignin extracted from exhausted olive pomace Amine Abid 1
&
Nicolas Brosse 2 & Isabelle Ziegler-Devin 2 & Slimane Gabsi 1
Received: 14 December 2019 / Accepted: 26 May 2020 # The Polymer Society, Taipei 2020
Abstract Organosolv lignin has been extracted from spent olive-pomace and converted into polyols by oxypropylation in presence of potassium hydroxide. Reaction parameters such as temperature, catalyst contents and lignin / propylene oxide ratio [L / PO (w / v)] were optimized. The macro-polyols obtained were characterized by FTIR spectroscopy, 13C NMR, 1H NMR, and size exclusion chromatography. The intrinsic viscosity, the amount of poly (propylene oxide) homopolymer (PPO) and the hydroxyl number (IOH) were also determined. Olive pomace- lignin based rigid polyurethane foams (RPU) have been produced and characterized. A RPU displaying specifications close to those of commercial RPU in terms of compressive strength (1.9 Mpa), density (40 Kg.m−3) and thermal conductivity (27 mW.mK−1) was produced. Keywords Lignin . Polyol . Oxypropylation . Rigid polyurethane foam . Olive pomace
Introduction Polyurethans constitute an important class of polymers commonly used in a wide range of applications (i.e. packaging, foams for seating, insulation etc.…). Polyurethans are produced by polycondensation through the reaction of a polyol with a polyisocyante. Currently, active research is carried out Electronic supplementary material The online version of this article (https://doi.org/10.1007/s10965-020-02228-9) contains supplementary material, which is available to authorized users. Statement of Novelty The use of lignin as a polymeric precursor for the preparation of new high value added products has been of great interest. This work was to contribute to this field by modifying the lignin organosolv extracted from olive pomace and using the oxypropylated liquid obtained as polyol for the preparation of rigid foams of polyurethane. * Amine Abid [email protected] 1
Energy, Water, Environment and Process Laboratory, National School of Engineering of Gabes University of Gabes, Omar Ibn ElKhattab, 6029 Gabes, Tunisia
2
Laboratory of Studies and Research on MAteriau Bois, Faculty of Science and Technology, University of Lorraine, Bld des Aiguillettes, PO Box 70236, 54506 Vandoeuvre-lès-Nancy Cedex, France
to produce bio-polyurethanes by partially or totally replacing the current raw materials derived from petrochemical ressources by renewable components [1–3]. Lignin which is an abundant biopolymer produced as a byproduct of pulp industry, is potentially a good candidate to be used as a polyol in polycondensation reactions. However, despite a great number of publications regarding lignin-based polyurethanes, the industrial utilizations of lignin in this field are scarce. Indeed, lignin is usually a low purity high variability co-product from pulp industry which makes it difficult to be used on an industrial scale. M
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