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Advisor(s)
Abstract(s)
Four lignin samples (Alcell, Indulin AT, Curan 27-11P and Sarkanda) were converted into liquid polyols by a chain extension reaction with propylene oxide (oxypropylation). The reaction was carried out in a batch reactor using potassium hydroxide (KOH) as a catalyst. The oxypropylation process was first optimized with Alcell lignin by modifying the lignin/propylene oxide ratio (L/PO, w/v) and catalyst content (C/(C+L), % w/w). L/PO ratios of 10/90, 20/80, 30/70 and 40/60, and catalyst contents from 2 to 5% were used. Based on the studied formulations, and considering the polyol requirements for polyurethane foam synthesis (a hydroxyl number (IOH) between 300 and 800 and a viscosity below 300 Pa.s), three formulations were chosen and applied for the oxypropylation the other lignin samples: 20/80/5, 30/70/2 and 35/65/2. The produced polyols were characterized. Their IOH and viscosity were found to be in the range of those typical of commercial polyols employed in polyurethane preparation.
Description
Keywords
Lignin Oxypropylation Biopolyols Characterization
Citation
Cateto, C.A.; Barreiro, M.F.; Rodrigues, A.E.; Belgacem, M.N. (2007-05) - Oxypropylation of lignins and characterization of the ensuing polyols.In 8th ILI Forum. Rome. p.115-118
Publisher
ILI - The International Lignin Institute