@Article{jrm.2023.029761,
AUTHOR = {Bengang Zhang, Antonio Pizzi, Mathieu Petrissans, Anelie Petrissans, Colin Baptiste},
TITLE = {Self-Cross-Linked Tannin-Aminated Tannin Surface Coatings for Particleboard},
JOURNAL = {Journal of Renewable Materials},
VOLUME = {11},
YEAR = {2023},
NUMBER = {12},
PAGES = {4097--4121},
URL = {http://www.techscience.com/jrm/v11n12/54558},
ISSN = {2164-6341},
ABSTRACT = {Aminated tannins were prepared by reacting mimosa condensed tannin extract with ammonia yielding the substitution of many, if not all of the tannin hydroxyl groups with –NH<sub>2</sub> groups. A tannin-aminated tannin (ATT)
particleboard coating was then prepared by reacting raw tannin extract with aminated tannin extract and thus
cross-liking the two by substituting tannin’s hydroxyl groups with the –NH<sub>2</sub> groups on the aminated tannin to
form –NH-bridges between the two. The resulting particleboard coating gave encouraging results when pressed
at 180°C for 3 min. Conversely, the system in which tannin was reacted/cross-liked with urea (ATU) by a similar
amination reaction did not perform as well as the ATT system, and this even when a higher curing temperature
and longer hot press time were used. In particular its water repellence was worse probably due to the presence of
urea and such a system lower reactivity. Nonetheless, substituting the tannin –OHs with the urea –NH<sub>2</sub> groups
appeared to also take place. ATT gave better results than ATU as regards water repellence and mechanical resistance as shown by the cross cut test. The ATT system was shown to be between 95% and 98% biosourced. The
difference appeared to be due, by TMA analysis, to the much faster formation of the ATT hardened network leading to a better cross-linked polymer coating. The chemical species formed for both the ATT and ATU system were
studied by MALDI ToF and CP MAS <sup>13</sup>C NMR.},
DOI = {10.32604/jrm.2023.029761}
}