2006
DOI: 10.1002/app.24744
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Structural modification and characterization of lignosulfonate by a reaction in an alkaline medium for its incorporation into phenolic resins

Abstract: ABSTRACT:We studied the enhancement of lignin reactivity in an alkaline medium, using sodium hydroxide in a microreactor set. The chemical composition and structural characterization of the reacted lignosulfonate in terms of the phenolic hydroxyl groups, aromatic protons, weight-average molecular weight, number-average molecular weight, and lignosulfonate content of all reacted lignins were determined. The techniques that we used were ultraviolet spectroscopy, proton nuclear magnetic resonance spectroscopy, an… Show more

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Cited by 40 publications
(35 citation statements)
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“…These changes indicate an increase in hydroxymethyl group abundance and ether bond scission resulting from the alkaline hydrolysis of lignin (El Mansouri et al 2006). Wysocka et al (2016).…”
Section: Resultsmentioning
confidence: 99%
See 1 more Smart Citation
“…These changes indicate an increase in hydroxymethyl group abundance and ether bond scission resulting from the alkaline hydrolysis of lignin (El Mansouri et al 2006). Wysocka et al (2016).…”
Section: Resultsmentioning
confidence: 99%
“…Alkaline hydrolysis of lignin was performed in a 100-mL pressurized reactor (Parr Instruments, Moline, IL, USA), according to the procedure described by El Mansouri et al (2006) at 170 °C for 2 h.…”
Section: Methodsmentioning
confidence: 99%
“…[83] Scheme 6d epicts the alkaline hydrolysis and purification of lignosulfonates. Alkalineh ydrolysish as been proposed to increase the reactivity of lignosulfonates.…”
Section: Alkaline Hydrolysis Of Lignosulfonatesmentioning
confidence: 99%
“…Therefore, lignin becomes more reactive toward the esterification reaction or hydrogen bonding at the interface. The appearance of new hydroxyl groups after alkaline treatment of lignocellulosic materials in lignin molecules is due to the cleavage of ether bonds, such as α and β-O-4, which are the major linkages in a lignin molecule (El Mansouri et al 2006). The second theory is related to substantial modification of the chemical composition of the fiber, thus affecting the intrinsic mechanical properties of the reinforcing fibers.…”
Section: Composites From Corn Stalks Fibersmentioning
confidence: 99%