Wood adhesives based on lignin wastes: Influence of the carbohydrates in the polymerization of spent sulfite liquor

Calve, L.; Fréchet, Jean M. J.

doi:10.1002/app.1983.070280612

Cited by 11 publications

(3 citation statements)

References 11 publications

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“…All these results suggested that formation of an unsaturated aldehyde function plays an important role in the polymerization of sugars. Study of the various polymerization catalysts indicated a clear cor relation between acid strength and catalytic activity (188).…”

Section: Addendamentioning

confidence: 99%

Activation of Wood Surface and Nonconventional Bonding

Zavarin

1984

Advances in Chemistry

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Section: Addendamentioning

confidence: 99%

Activation of Wood Surface and Nonconventional Bonding

Zavarin

1984

Advances in Chemistry

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“…This leads to the decrease in the adhesion strength of the liquor. Whereas, the polymerization of free sulphonic acid may be responsible for the binding action of the SSL (Calve and Frechet, 1983). pH value of the pulp suspension containing SSL and relatively low percent (0.5‐1.0 percent) of resol resin is still in the acidic range (pH: 5.3‐5.7).…”

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

A study of the effects of SSL on the adhesion property of phenolic resin in production of agro‐based composite

El‐Saied

Basta

2006

Pigment &Amp; Resin Technology

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PurposeTo investigate the role of spent sulphite liquor (SSL) retained on neutral sulphite bagasse pulp in the binding action of phenolic resin, for the purpose of enhancing its performance to produce high quality agro‐based composite.Design/methodology/approachPulps used in this work as agro‐based fibres were prepared from Asplund defibrator and neutral sulphite pulping processes. The performance of the resol resin in presence of SSL, were evaluated in terms of the effects of SSL constituents and using novolac as phenolic resin, in comparison with that prepared from pulps in absence of SSL and conventionally prepared resol – Asplund bagasse composites. Preparation of pulp free from sulphonyl groups and pre‐out‐precipitating the resol or lignosulphonic acid (LSA) on the strength and water resistance properties of the composite produced was also examined. The degraded hemicellulose and LSA in SSL were polynomial correlated with the changes in composites properties.FindingsAll neutral sulphite pulps investigated, in presence of SSL, were found to enhance the strength quality of agro‐based composite compared to commercially available resol‐agro‐based composite. The retained SSL on NS‐raw bagasse pulp could replace the Asplund bagasse pulp together with resol resin in production of agro‐composite. As well as, using neutral sulphite – Asplund bagasse pulp reduced the percent of added resol to half, to produce commercial resol agro‐based composite. The performance of the composite produced from novolac resin‐SSL‐neutral sulphite pulp and resol‐LSA‐neutral sulphite pulp exceeded 1.5 to 1.9 times the strength of commercially available composite.Research limitations/implicationsDespite the SSL retained on pulp success in improving the strength property of the resol resin‐agro‐composites, but it has an undesirable effect on water resistance of the product. This problem was resolved by avoiding the undesirable effect of sulphonyl groups on pulp fibres as well as the degraded hemicellulose in SSL.Practical implicationsThe approach developed provided a simple and practical solution to enhancing the performance of phenolic resin as well as agro‐fibres and SSL wastes in the production of high performance lignocellulosic composite.Originality/valueThe resol, together with SSL constituents retained on neutral sulphite pulp, are economic bonding agents for agro‐fibres and could be used in wood mills for production of medium density fibre‐board.

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Untersuchungen zur gelpermeationschromatographischen Fraktionierung von Natrium‐Ligninsulfonat

Polter¹

1988

Acta Biotechnologica

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The gelpermeation chromatography of sodium ligncsulfonates with bidistilled water as an eluent is influenced by the volunie expansion of the polyelectrolyte, by the negative changes of the gels, and by the inclusion effect so markedly t h a t true conclueions on the molecular weight distribution of sodium lignosulfoiiate cannot be drawn. Using electrolytes as an eluent these irregularities can be avoided. Polydispersity of these mncromolecules however prevents separation into discrete peaks. As a result of this behaviour changes of molecular weight distribution are only poorly recognized. Therefore, on studying biotransformation of lignosulfonic acids we purpose t o use gels by which one part of the lignosulfonates is excluded, and biotransformation may be controlled by the ratio of excluded part of the lignosulfonates t o that part retarded by the gels. Einleitung

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Wood adhesives based on lignin wastes: Influence of the carbohydrates in the polymerization of spent sulfite liquor

Cited by 11 publications

References 11 publications

Activation of Wood Surface and Nonconventional Bonding

Activation of Wood Surface and Nonconventional Bonding

A study of the effects of SSL on the adhesion property of phenolic resin in production of agro‐based composite

Untersuchungen zur gelpermeationschromatographischen Fraktionierung von Natrium‐Ligninsulfonat

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