Preparation of Lignopolyols from Wheat Straw Soda Lignin

Ahvazi, Bijan; Wojciechowicz, Olivia; Ton-That, Tan-Minh; Hawari, Jalal

doi:10.1021/jf202452m

Cited by 113 publications

(99 citation statements)

References 25 publications

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“…As a result of the direct oxyalkylation with PC, lignin polyols with exclusively aliphatic OH groups were generated. This OH profile was similar to that of lignin polyols synthesized by oxyalkylation with PO (Ahvazi et al 2011;Sadeghifar et al 2012).…”

Section: Direct Oxyalkylation Of Ligninsupporting

confidence: 67%

“…In contrast to the oxyalkylation with PO, the carboxylic acids of the maleated lignin were not completely hydroxypropylated (Ahvazi et al 2011). In analogy to the spectrum of hOL, two distinct broad signals were seen in the aliphatic region, which can be assigned to the remaining OH groups in OL (146.5-149.5 ppm) and the hydroxypropyl OH groups (145.5-146.5 ppm).…”

Section: Two-step Oxyalkylation Of Ligninmentioning

confidence: 93%

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Synthesis of lignin polyols via oxyalkylation with propylene carbonate

Kühnel

Podschun²,

Saake³

et al. 2014

Holzforschung

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An efficient, nontoxic, and solvent-free oxyalkylation of European beech wood organosolv lignin (OL) has been developed. Two approaches were studied: a direct reaction of lignin with propylene carbonate (PC) and a two-step reaction of lignin with maleic anhydride (MA) followed by oxyalkylation with PC. The structural analysis of lignin polyols was performed by 1 H NMR, 13 C NMR, 31 P NMR, and FTIR spectroscopy. It was demonstrated that PC was able to almost completely oxypropylate aliphatic and phenolic OH groups. Moreover, the carboxylic acid groups of maleated OL were fully oxypropylated by PC. This modification strongly facilitates the generation of a uniform lignin polyol applicable as a biobased component in polyurethanes and polyesters based on cyclic organic carbonates.

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Section: Direct Oxyalkylation Of Ligninsupporting

confidence: 67%

Section: Two-step Oxyalkylation Of Ligninmentioning

confidence: 93%

Synthesis of lignin polyols via oxyalkylation with propylene carbonate

Kühnel

Podschun²,

Saake³

et al. 2014

Holzforschung

View full text Add to dashboard Cite

show abstract

“…Esterification of lignin using e-caprolactone, maleic anhydride, and succinic anhydride can be carried out to increase the reactivity for the production of lignin-based epoxy resins [135][136][137] and polyurethanes [138].…”

Section: Esterificationmentioning

confidence: 99%

Conversion of technical lignins to functional materials with retained polymeric properties

Matsushita

2015

J Wood Sci

158

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A significant amount of technical lignins is produced in the pulp and paper industries. However, most technical lignins are burned for thermal recycling and a few percent are used as materials, such as lignosulfonate as a dispersant. Native lignin has a highly complex structure and is susceptible to structural variations depending on the pulping process, thus hindering the effective utilization of lignins. The procedures used to convert lignins into functional materials include depolymerization to monomeric fragments followed by re-building to functional materials, and chemical modifications to generate functional polymers with retained polymeric properties. In this paper, the latter is disserted. The characteristics of technical lignins, which include kraft lignin, lignosulfonate, and organosolv lignin, and their conversion to functional materials such as polyesters, polyethers, polyurethanes, etc. and the applications of lignin-based materials in some fields are discussed.

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“…Several studies have suggested that the solubility and uniformity of the lignin are the key parameters that affect its reactivity as a substitute for polyol in PU fabrication (Hsu and Glasser 1976;Saraf et al 1985;Rials and Glasser 1986;Mörck et al 1988;Ciobanu et al 2004;Hatakeyama et al 2008). Lignin substitution in PU could be achieved directly by the combination with polyol (Yoshida et al 1990;Evtuguin et al 1998;Vanderlaan and Thring 1998;Cateto et al 2008) or through chemical modifications (Glasser 1989;Gandini et al 2002;Nadji et al 2005;Ahvazi et al 2011).…”

Section: Introductionmentioning

confidence: 99%

Formation of Ligno-Polyols: Fact or Fiction

Ahvazi

Wojciechowicz

et al. 2017

BioResources

Self Cite

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The physical and chemical characteristics of several lignin-polyol blends were investigated by qualitative and quantitative methods from the view of biobased polyurethane applications. Four differently isolated biomass lignins from forestry and agricultural residues were blended with polyester polyol, and one was blended with polyethylene glycol. The isolated products were examined thoroughly to elucidate the subsequent lignin and polyol interactions during the premixing stage of biobased polyurethane formulation. Polyol was detected in lignin even after vigorous washings with several organic solvents and Soxhlet extraction. The experimental data coupled with two-dimensional heteronuclear multiple quantum coherence (HMQC) and nuclear magnetic resonance (NMR) spectroscopy confirmed the formation of ligno-polyols via strong intermolecular attractions, as well as some linkages between several lignin hydroxyl and polyol functional groups.

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Preparation of Lignopolyols from Wheat Straw Soda Lignin

Cited by 113 publications

References 25 publications

Synthesis of lignin polyols via oxyalkylation with propylene carbonate

Synthesis of lignin polyols via oxyalkylation with propylene carbonate

Conversion of technical lignins to functional materials with retained polymeric properties

Formation of Ligno-Polyols: Fact or Fiction

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