Research Article
A Simple Approach to Distinguish Classic and Formaldehyde-Free Tannin Based Rigid Foams by ATR FT-IR
Table 1
Composition by weight of classic and formaldehyde-free tannin based rigid foams.
| | Chemicals | Classic TBRFs (%)
Room temperature | Formaldehyde-free TBRFs (%)
Hot press at 120°C |
| | Mimosa tannin | 47.7 | 52.6 | | Furfuryl alcohol | 16.7 | 13.1 | | Formaldehyde | 4.3 | — | | Blowing agent | 4.8 | 3.5 | | Acid catalyst | 12.4 | 5.8 | | Water | 14.1 | 25.0 |
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