TY  - EJOU
AU  - Falavinha, João Vitor Dorini 
AU  - Cademartori, Pedro Henrique Gonzales De 
AU  - Gérardin, Philippe 
AU  - Pizzi, Antonio 
AU  - Gérardin-Charbonnier, Christine 

TI  - New Rigid Furan Biofoams Based on Hydrolysable Chesnut (<i>Castanea sativa</i>) Tannin by Chemical Expansion
T2  - Journal of Renewable Materials

PY  - 2025
VL  - 13
IS  - 4
SN  - 2164-6341

AB  - Tannins are polyphenols widely present in the plant kingdom, commonly divided into two groups: condensed and hydrolysable tannins. Sustainable furanic bio-foams based on condensed tannins have been largely studied, but little is described about the use of hydrolysable tannins for this material. This study examined the potential of hydrolysable chestnut tannin in comparison to condensed mimosa tannins to produce furanic foams by chemical expansion. Due to the low reactivity of the hydrolysable tannin, the use of an external source for its polymerization and curing was necessary. Through Fourier transform infrared spectroscopy (FTIR) chromatography, it was possible to observe that the new foams presented small differences in functional groups compared to the condensed tannin foams, presenting peaks related to carboxyl groups. In terms of physical properties, the chestnut foams showed an apparent density 36% higher than the conventional mimosa tannin foams and a superior hydrophilic character. In terms of thermal properties, both foams exhibit high thermal stability, with the acacia tannin foam being slightly superior. In summary, this research paves the way for new applications of hydrolysable tannins in bio-foams and materials science.
KW  - Tannin foams; furfuryl alcohol; hydrolysable tannin; chestnut

DO  - 10.32604/jrm.2025.058902