Lignin-based Foams: Production Process and Characterization

Gianluca Tondi, Martin Link, Christian Kolbitsch, Johannes Gavino, Paul Luckeneder, Alexander Petutschnigg, Richard Herchl, Charlie Van Doorslaer

Abstract


Lignin foams are innovative materials obtained by the copolymerization of furanics with the spent liquor from the magnefite wood pulping process. In this study, the influence of the component amount in the formulation, as well as the effect of temperature on the final product, were elucidated. Several formulations, with various lignin/furanic ratios, blowing agents, and catalyst concentrations, exhibited good homogeneity and densities between 185 and 407 kg m-3. The mechanical properties, as well as the thermal conductivities, confirmed the strong dependence on density, and the results obtained were comparable to that of tannin foams. The leaching tests revealed that the lignin foams released a certain amount of catalyst within the first minutes of water dipping. However the pH of this leachate stabilized quickly, which suggests that the catalyst can be easily recovered.

Keywords


Insulation material; Lignin valorization; Natural foam; Renewable resource; Sustainable material

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Welcome to BioResources! This online, peer-reviewed journal is devoted to the science and engineering of biomaterials and chemicals from lignocellulosic sources for new end uses and new capabilities. The editors of BioResources would be very happy to assist you during the process of submitting or reviewing articles. Please note that logging in is required in order to submit or review articles. Martin A. Hubbe, (919) 513-3022, hubbe@ncsu.edu; Lucian A. Lucia, (919) 515-7707, lucian.lucia@gmail.com URLs: bioresourcesjournal.com; http://ncsu.edu/bioresources ISSN: 1930-2126