Journal
BIORESOURCE TECHNOLOGY
Volume 100, Issue 21, Pages 5162-5169Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2009.05.055
Keywords
Tannins foams; Phenolic foams; Physical properties; Chemical resistance
Funding
- CPER
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Tannin-based rigid foams, prepared from 95% natural material, are Suggested for replacing synthetic phenol-formaldehyde foams in various applications. For that purpose, a few physical properties were measured and reported here: resistance to fire and chemicals, absorption of various liquids, permeability, thermal conductivity and mechanical (compressive and tensile) strength. Modifying the composition through the use of boric and/or phosphoric acid allowed substantial increase of fire resistance. The materials were also found to present good resistance to strong acid and bases, and to solvents. High affinity for water, but limited one for organic liquids, was also evidenced. Finally, slightly anisotropic mechanical properties were measured. The materials present a brittle behaviour, whether tested in compression or traction; nevertheless, their strengths, as well as their thermal conductivities, are fully comparable with those of their phenolic counterparts. We show that such materials of vegetable origins can compete with synthetic ones for most of traditional applications. (C) 2009 Elsevier Ltd. All rights reserved.
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