Bioresourced pine tannin/furanic foams with glyoxal and glutaraldehyde

Tannin-Based Biofoams-a Review

“…Pine bark tannins are much more reactive than mimosa and quebracho tannins experimented with up to 2012. Pine bark tannin/furanic foams were prepared for the first time in 2013 [54][55][56][57]. The high reactivity of pine tannins in relation to other tannins induced fundamental changes in the tannin foam formulations in order to coordinate foam resin hardening, reaction exotherm and solvent blowing allowing the formation of a rigid foam.…”

“…Pine tannin foams without formaldehyde showed lower mechanical strength and more elastic behaviour. This work permitted clearly the application of such type of tannin-furanic foam formulations to the whole class of very reactive procyanidin tannins, not only different species of pine tannins [54][55][56][57] but also spruce tannins [58][59][60][61], and others. Formaldehyde-free, in reality any-aldehyde-free pine tannin foams have also been developed but present lower mechanical resistance undergoing compression.…”

“…Formaldehyde-free, in reality any-aldehyde-free pine tannin foams have also been developed but present lower mechanical resistance undergoing compression. Thus, formaldehyde-free pine tannin/furanic rigid foams were successfully prepared by a new approach, namely using alternative nontoxic [45,46], non-volatile aldehydes as hardeners: glyoxal or glutaraldehyde [54][55][56]. Furthermore, open cells structure tannin-furanic foams prepared using pine bark tannin and mimosa/quebracho type tannins have been shown to give good sound absorption/acoustic insulation characteristics at medium and high frequencies (1000-4000 Hz) with coefficient of acoustic absorption of 0.85-0.97 [62].…”

Synthesis and Characterization of Lignin-Based Adhesive Cross-Linked With Furfuryl Alcohol–formaldehyde and Epoxy Resins

“…11 Furfuryl alcohol comes from the hydrolysis of plant biomass and has been widely used due to its structure stability and good water resistance. [12][13][14] The hydroxymethyl group of furfuryl alcohol can easily react with the phenol ring of lignin under acid conditions for further polymerization to improve the binding strength and water resistance of lignin-based adhesive. However, the furfuryl alcohol self-condensation reaction 15,16 predominates to an extent that leads to slight or no co-reaction with lignin.…”

Development and Characterization of a Bayberry Tannin-based Adhesive for Particleboard

“…In recent years, natural tannin and furfuryl alcohol originating from forestry and agriculture have been widely used as new bio-based materials in the polymer material industry to replace petrochemicals, such as tannin-furanic insulation foams and floral foams (Lacoste et al 2013(Lacoste et al , 2014Basso et al 2014). Tannin-furanic (TF) plastics have been studied for their excellence in thermal resistance, low density, and good mechanical properties (Li et al 2013).…”