Pine tannin-based rigid foams: Mechanical and thermal properties

Lacoste, Clément; Basso, María Cecilia; Pizzi, A.; Laborie, Marie‐Pierre; Celzard, Alain

doi:10.1016/j.indcrop.2012.07.039

Cited by 100 publications

(65 citation statements)

References 11 publications

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“…2. This was rather different from the previously recorded behavior of formulations not containing a surfactant, in which crosslinking starts as the temperature of the reaction reaches its maximum (Basso et al 2013). As seen in Fig.…”

Section: Resultscontrasting

confidence: 95%

Dynamic Monitoring of Tannin-based Foam Preparation: Effects of Surfactant

2013

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Three tannin-based foam formulations differing in the type of surfactant added were tested during foaming via simultaneous monitoring of the variation in temperature, foam rising rate, internal foam pressure, and dielectric polarization, the latter being a direct measure of the setting and curing of a thermosetting foam. This monitoring is an effective descriptor of the process and possible characteristics of the foam being prepared and constitutes an invaluable tool for foam formulation. The addition of a surfactant was shown to have a major effect on foam dynamics by retarding the onset of cross-linking to a lesser or greater extent in relation to the peak of maximum temperature in self-blowing foams. Cationic surfactants, or non-ionic surfactants capable of transforming into cationic species under the acidic environmental conditions used for tannin-based foams, were found to retard cross-linking more markedly than did non-ionic surfactants.

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Section: Resultscontrasting

confidence: 95%

Dynamic Monitoring of Tannin-based Foam Preparation: Effects of Surfactant

2013

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“…Mechanical strength at 20% deformation for R80B samples is about 0.19 MPa with a Young's modulus of 3.5 MPa. The mechanical characteristics of the R80B foam at 0.06 g/cm 3 are better than those of the pine tannin-furanic foams having the same density [18]. They are comparable to those measured for quebracho tannin-furanic foams, presenting the same density, but also containing formaldehyde and a flammable solvent [19], this latter needing special handling.…”

Section: Resultsmentioning

confidence: 50%

MALDI-TOF and 13C NMR Analysis of Tannin–Furanic–Polyurethane Foams Adapted for Industrial Continuous Lines Application

et al. 2014

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Mixed phenolic-polyurethane-type rigid foams were developed using tannin-furfuryl alcohol natural materials co-reacted with polymeric isocyanate in the proportions imposed by the limitations inherent to continuous industrial plants for polyurethane foams. A variety of different copolymerization oligomers formed. Urethanes appeared to have been formed with two flavonoid tannin sites, mainly at the flavonoid hydroxyl group at C3, but also, although less, on the phenolic hydroxyl groups of the flavonoid oligomers. Urethanes are also formed with (i) glyoxal in the formulation, be it pre-reacted or not with the tannin; (ii) with phenolsulfonic acid and (iii) with furfural. This latter one, however, greatly favors reaction with the A-ring of the flavonoids through OPEN ACCESSPolymers 2014, 6 2986 a methylene bridge rather than reaction with the isocyanate groups to form urethanes. All of the materials appeared to have co-reacted in a manner to form urethane and methylene bridges between all of the main components used. Thus, the tannin, the furfuryl alcohol, the isocyanate, the glyoxal and even the phenol sulfonic acid hardener formed a number of mixed species linked by the two bridge types. Several mixed species comprised of 2, 3 and even 4 co-reacted different components have been observed.

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“…Afterwards, major advances were achieved first with tannin-furanic foams without formaldehyde (Basso et al 2011) or modification with small amounts of polyisocyanate (Li et al 2012a), second with foams using a safer blowing agent, namely pentane, and even with no blowing agent at all (Basso et al 2013a;Li et al 2013b), third with foams using alternative non-toxic, nonvolatile aldehydes , and finally using the much more reactive and difficult to handle procyanidin-type tannins such as for example pine and spruce bark tannins (Cop et al 2014;Lacoste et al 2013Lacoste et al , 2014. Even simplified foams in which the tannin was substituted with fine wood powder were tried (Srivastava and Pizzi 2014).…”

Section: Biobased Wood-derived Foamsmentioning

confidence: 99%

Wood products and green chemistry

Pizzi

2016

Annals of Forest Science

160

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& Key message Green chemistry for and from wood has developed numerous industrial products, namely biosourced, green wood adhesives and preservatives, foams, composite matrices, laminates, hard and flexible plastics, flexible films, and abrasive grinding discs, and their number is still growing. & Introduction This review addresses (1) the elimination of toxic aldehydes from the most common wood panel adhesive, the one based on urea, itself a natural product, (2) biosourced adhesives derived from wood or other vegetable matter and used for wood products, and (3) wood and bark tannin-based foams, natural fiber composites using tannin matrices, paper surface laminates and continuous high-pressure paper laminates using tannin-furanics, hard plastics based on tanninfuranic materials and some of their applications, flexible biosourced tannin-furanic films, and biosourced wood preservatives.

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Pine tannin-based rigid foams: Mechanical and thermal properties

Cited by 100 publications

References 11 publications

Dynamic Monitoring of Tannin-based Foam Preparation: Effects of Surfactant

Dynamic Monitoring of Tannin-based Foam Preparation: Effects of Surfactant

MALDI-TOF and 13C NMR Analysis of Tannin–Furanic–Polyurethane Foams Adapted for Industrial Continuous Lines Application

Wood products and green chemistry

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