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Open AccessArticle

Using Sulfobutylated and Sulfomethylated Lignin as Dispersant for Kaolin Suspension

by 1,2 and 1,3,*
1
Department of Chemical Engineering, Lakehead University, Thunder Bay, ON P7B 5E1, Canada
2
Department of Chemical Engineering, Afyon Kocatepe University, Afyonkarahisar 03200, Turkey
3
State Key Laboratory of Biobased Material and Green Papermaking, Qilu University of Technology (Shandong Academy of Sciences), Jinan 250353, China
*
Author to whom correspondence should be addressed.
Polymers 2020, 12(9), 2046; https://doi.org/10.3390/polym12092046
Received: 10 August 2020 / Revised: 31 August 2020 / Accepted: 3 September 2020 / Published: 8 September 2020
(This article belongs to the Section Biomacromolecules, Biobased and Biodegradable Polymers)
Kraft lignin is an abundant natural resource, but it is underutilized. In this study, sulfoalkylated lignin derivatives with similar charge densities but with different alkyl chain length were produced via sulfobutylation and sulfomethylation reactions. The contact angle studies revealed that sulfobutylated lignin (SBL) with longer alkyl chains had a higher hydrophobicity than sulfomethylated lignin (SML) did. The adsorption behavior of sulfoalkylated lignins was studied using a Quartz crystal microbalance with dissipation (QCM-D) on Al2O3 coated surface as representative of positively charged sites of kaolin particles. The results of adsorption studies showed that SBL deposited more greatly than SML did on the Al2O3 surface, and it generated a thicker but less viscoelastic adlayer on the surface. The adlayer thickness and configuration of molecules on the surface were also related to the zeta potential and stabilization performance of the polymers in the kaolin suspension system. The results also confirmed that both lignin derivatives were very effective in dispersing kaolin particles at neutral pH, and their effectiveness was hampered under alkaline or acidic pH. View Full-Text
Keywords: lignin; biopolymer; sulfobutylation; sulfomethylation; QCM; zeta potential; dispersion lignin; biopolymer; sulfobutylation; sulfomethylation; QCM; zeta potential; dispersion
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MDPI and ACS Style

Hopa, D.Y.; Fatehi, P. Using Sulfobutylated and Sulfomethylated Lignin as Dispersant for Kaolin Suspension. Polymers 2020, 12, 2046. https://doi.org/10.3390/polym12092046

AMA Style

Hopa DY, Fatehi P. Using Sulfobutylated and Sulfomethylated Lignin as Dispersant for Kaolin Suspension. Polymers. 2020; 12(9):2046. https://doi.org/10.3390/polym12092046

Chicago/Turabian Style

Hopa, Derya Y.; Fatehi, Pedram. 2020. "Using Sulfobutylated and Sulfomethylated Lignin as Dispersant for Kaolin Suspension" Polymers 12, no. 9: 2046. https://doi.org/10.3390/polym12092046

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