期刊
INDUSTRIAL CROPS AND PRODUCTS
卷 54, 期 -, 页码 40-53出版社
ELSEVIER
DOI: 10.1016/j.indcrop.2014.01.012
关键词
Tannin; Foam; Porosity; Mechanical strength; Thermal conductivity
资金
- European (FEDER)
- CPER Structuration du Pole de Competitivite Fibres Grand'Est (Competitiveness Fibre Cluster), through local (Conseil General des Vosges), regional (Region Lorraine), national (DRRT and FNADT)
Phenolic foams derived from natural precursors, condensed tannin extracts from mimosa trees, were prepared for the first time by curing and drying liquid foams obtained by aeration of tannin solutions containing surfactant and crosslinker. The materials derived from the new method were called tannin-based meringues in reference to the lightweight pastry made in a similar way by whipping egg whites. The new foams were compared with more standard cellular solids having very close composition but obtained by physical or chemical foaming. No significant differences were observed in terms of mechanical and thermal properties. The porous structure was also similar, except the cell sizes which were much higher in tannin-based meringues. The new method is not only easy, fast and cost-effective, but allows producing solid foams having a very broad range of bulk densities and cell sizes, which can be controlled by the concentration of tannin in the initial solution, all other things being equal. (C) 2014 Elsevier B.V. All rights reserved.
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