Synthesis of Lignosulfonate-Based Dispersants for Application in Concrete Formulations
authors Magina, S; Barros-Timmons, A; Evtuguin, DV
nationality International
journal MATERIALS
author keywords lignosulfonate; concrete; laccase; Eucalyptus globulus; polyoxometalate; poly(propylene glycol); poly(ethylene glycol); dispersion
keywords HIGH-PERFORMANCE DISPERSANT; OXIDATIVE DELIGNIFICATION; CALCIUM LIGNOSULFONATE; RESIDUAL LIGNIN; MODEL COMPOUNDS; MALDI-TOF; LACCASE; SUPERPLASTICIZERS; ADSORPTION; POLYCARBOXYLATE
abstract Lignosulfonates (LS) are products from the sulfite pulping process that could be applied as renewable environmentally-friendly polymeric surfactants. Being widely used as plasticizers and water-reducing admixtures in concrete formulations LS compete in the market with petroleum-based superplasticizers, such as naphthalene sulfonate formaldehyde polycondensate (NSF) and copolymer polycarboxylate ethers (PCE). In this work, different chemical modification strategies were used to improve LS performance as dispersants for concrete formulations. One strategy consisted in increasing the molecular weight of LS through different approaches, such as laccase and polyoxometalate-mediated polymerization, glyoxalation, and reversible addition-fragmentation chain transfer (RAFT) polymerization. The other strategy consisted of preparing LS-based non-ionic polymeric dispersants using two different epoxidized oligomer derivatives of poly(ethylene glycol) (PEG) and poly(propylene glycol) (PPG). Modified LS were used to prepare cement pastes, which were examined for their fluidity. Results revealed that the most promising products are PPG-modified LS due to the introduction of PPG chains by reaction with phenolic moieties in LS. The enhanced dispersant efficiency of the ensuing products is probably related not only to electrostatic repulsion caused by the sulfonic ionizable groups in LS but also to steric hindrance phenomena due to the grafted bulky PPG chains.
publisher MDPI
isbn 1996-1944
year published 2021
volume 14
issue 23
digital object identifier (doi) 10.3390/ma14237388
web of science category 18
subject category Chemistry, Physical; Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering; Physics, Applied; Physics, Condensed Matter
unique article identifier WOS:000734975500001
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journal analysis (jcr 2019):
journal impact factor 3.057
5 year journal impact factor 3.424
category normalized journal impact factor percentile 58.121
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