Tannin-based rigid foams: Characterization and modification

Tondi, Gianluca; Pizzi, A.

doi:10.1016/j.indcrop.2008.07.003

Cited by 197 publications

(122 citation statements)

References 5 publications

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“…The concentration of phenolic compounds in a plant is influenced by the genetics of the species as well as the environmental conditions of the area in which it is located. The nature of phenolic tannins allows them to react with aldehydes under both acidic and alkaline conditions, which allows for their effective use as wood adhesives (Tondi and Pizzi 2009). The most common commercially-condensed tannins come from mimosa bark (Acacia mearnsii or mollissima), Quebracho wood (Schinopsis balansae and Schinopsis lorentzii), pine bark (Pinus radiata), and Gambier leaves (Uncaria gambier) (Tondi and Pizzi 2009).…”

Section: Introductionmentioning

confidence: 99%

“…The nature of phenolic tannins allows them to react with aldehydes under both acidic and alkaline conditions, which allows for their effective use as wood adhesives (Tondi and Pizzi 2009). The most common commercially-condensed tannins come from mimosa bark (Acacia mearnsii or mollissima), Quebracho wood (Schinopsis balansae and Schinopsis lorentzii), pine bark (Pinus radiata), and Gambier leaves (Uncaria gambier) (Tondi and Pizzi 2009). According to Santos et al (2002), the condensed tannins from Stryphnodendron genus are formed with prodelphinidin units.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Tannin Adhesive from Stryphnodendron adstringens (Mart.) Coville in Plywood Panels

Carvalho¹,

Zanuncio²,

Mori³

et al. 2014

BioResources

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The aim of this study was to evaluate the technical viability of using tannin adhesives derived from Stryphnodendron adstringens (Mart.) Coville barks in the production of plywood. 0, 25, 50, 75, and 100% tannin-based adhesives (TF) derived from barbatimão barks were combined with commercial phenol-formaldehyde (PF) adhesive. The properties of the adhesives were determined, and plywood was produced. The panels were produced with five crossed layers, an adhesive grammage of 360 g/m² (double line), and an assembly time of 10 min. A pressing cycle at a temperature of 150 °C, specific pressure of 12 kgf/cm², and duration of 10 min was used. With the exception of the parallel modulus of elasticity, panels produced with 25, 50, 75, and 100% barbatimão-derived tannin adhesive met NBR 31:000.05-001/2 standards (ABNT 2001). The tannin barbatimão adhesive proved feasible for use in plywood panels destined for both humid and dry environments.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Tannin Adhesive from Stryphnodendron adstringens (Mart.) Coville in Plywood Panels

Carvalho¹,

Zanuncio²,

Mori³

et al. 2014

BioResources

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show abstract

“…At first, development concentrated mainly on exploring variations on the basic formulation of 1994 and intensive characterization of all the relevant physical, mechanical, thermal, and other properties Tondi and Pizzi 2009;Tondi et al 2008a, b, c, d;2009a, b, c;Celzard et al 2010Celzard et al , 2011 and of their carbonized counterparts (Tondi et al 2008b, c;Tondi and Pizzi 2009). 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.…”

Section: Biobased Wood-derived Foamsmentioning

confidence: 99%

Wood products and green chemistry

Pizzi

2016

Annals of Forest Science

163

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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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“…The method used to prepare the rigid tannin-based foams has been described in previous studies (Meikleham and Pizzi 1994;Tondi and Pizzi 2009;Celzard et al 2011). In short, the mimosa bark tannin extracts (Silva Chimica, St. Michele Mondovi, Italy) were mixed with water, furfuryl alcohol was added as a co-reagent, formaldehyde was added as a further cross-linker, and diethyl ether was added as a blowing agent.…”

Section: Preparation Of Foamsmentioning

confidence: 99%

“…This is because the self-blowing mixture of resins and additives needs to be well balanced with respect to its simultaneous foaming and setting. That is, the characteristics of early foaming and late setting, and likewise of early setting and late foaming, will not produce a rigid hardened foam (Tondi and Pizzi 2009).…”

Section: Introductionmentioning

confidence: 99%

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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Tannin-based rigid foams: Characterization and modification

Cited by 197 publications

References 5 publications

Tannin Adhesive from Stryphnodendron adstringens (Mart.) Coville in Plywood Panels

Tannin Adhesive from Stryphnodendron adstringens (Mart.) Coville in Plywood Panels

Wood products and green chemistry

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

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