Structure and Characterization of Sulfated Chitosan Superplasticizer

Lv, Shenghua; Cao, Qiang; Zhou, Qiang; Shuili, Lai; Gao, Futang

doi:10.1111/jace.12221

Cited by 12 publications

(6 citation statements)

References 17 publications

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“…It was shown in [Figure (a)] that paste fluidity decreased with increasing PEO density and molecular weight, while the dosage of SPCE was kept the same (from 0.10% to 0.20%). In fact, previous studies on cement paste system have revealed that a high density of PEO in the side‐chains and a high molecular weight of PCEs had a strong influence on the dispersion properties of PCEs . From Table , the adsorption percentage and absolute value of Zeta potential followed the order: SPCE1 ≈ SPCE2 > SPCE3.…”

Section: Resultsmentioning

confidence: 99%

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Regulating the arm structure of star‐shaped polycarboxylate superplasticizers as a means to enhance cement paste workability

Zhao

Nian

Pang

et al. 2018

J of Applied Polymer Sci

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Star-shaped superplasticizers, which incorporated polyol ester with unsaturated bond at their cores and bore comb-type structures as their arms were synthesized via esterification-copolymerization in aqueous phase from pentaerythritol, acrylic acid (AA), and isopentenyl oxy poly(ethylene glycol ether) (TPEG). The monomer ratios of AA and TPEG were varied and comonomer sodium methallyl sulfonate (SMAS) bearing short side chains was added to regulate the arm structure of star-shaped polycarboxylate superplasticizers (SPCEs). The effects of the SPCEs on cement paste were investigated and the cement dispersion as well as early hydration mechanism were explored. As a main result, SPCEs with SMAS and certain molar ratios for anchoring groups and PEO side-chains in their arm structure exhibited good paste dispersion and fluidity retention, which also delayed the early hydration process and prolonged both the initial and the final setting time.

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Section: Resultsmentioning

confidence: 99%

“…it was illustrated that the chemical structure of SPCEs affects its adsorption behavior on cement particle surface and the adsorption of SPCEs boost the electrostatic repulsion in the meantime. That is also a factor which led to the improved dispersal …”

Section: Resultsmentioning

confidence: 99%

Regulating the arm structure of star‐shaped polycarboxylate superplasticizers as a means to enhance cement paste workability

Zhao

Nian

Pang

et al. 2018

J of Applied Polymer Sci

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“…A superfície da quitosana contém um grande número de grupos amino e hidroxila, que podem ser facilmente modificados para produzir uma resposta a diferentes comportamentos [27]. Aliado ao seu baixo custo, sua utilização tem sido bastante investigada no meio científico ao longo dos anos, e não só na área da construção civil em compósitos cimentícios [28][29][30][31][32][33][34][35][36][37][38][39][40][41][42][43], como também em outras aplicações, tais como, na medicina [44,45], na agricultura [46,47] e cosméticos [48,49].…”

Section: Introductionunclassified

Concreto de cimento Portland dopado com quitosana: propriedades mecânicas e microestrutural

Silva

et al. 2023

Matéria (Rio J.)

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RESUMO A construção civil exerce função importante no consumo de energia em todo o mundo e influência, de forma significativa, o consumo total de recursos naturais e as emissões de CO2. A utilização de materiais renováveis está intrinsecamente relacionada à pesquisa e à inovação. A reutilização, a reciclagem, bem como o desenvolvimento de novos materiais e a descoberta de novas aplicações para materiais renováveis já conhecidos, podem contribuir de maneira expressiva para o desenvolvimento sustentável. A quitosana (CS) é um biopolímero com uma estrutura química e características únicas aliadas à sua farta disponibilidade como derivado da quitina, fazem com que suas possibilidades de aplicação nos mais diferentes campos tecnológicos, tenha se expandido consideravelmente. No presente trabalho, a utilização da quitosana para produção de concretos por meio de teores ótimos é investigada. Os valores de quitosana incorporados na dosagem foram 0,1%; 0,3% e 0,4%, com relação à massa de cimento. Os diferentes concretos obtidos foram submetidos a ensaios de propriedades mecânicas e microestrutural. Os resultados mostraram que a microestrutura foi favorecida com a utilização da quitosana. Bem como, apresentaram resultados favoráveis à incorporação dos teores utilizados de quitosana (se desatacando as amostras com 0,1% de substituição), sendo positivos quanto às propriedades mecânicas para a maioria das técnicas utilizadas, o que indica fortemente que a quitosana pode ser considerada como material promissor a ser incorporado na produção de concreto.

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“…According to the similar aggregation effects of cement and kaolin particles, we hypothesized that TPEG‐based polymers might serve as effective dispersants for both of these kinds of inorganic particles. Moreover, we selected the lower molecular weight macromonomer and added sodium methylallyl sulfonate (SMAS) as a chain‐transfer agent to adjust the molecular weight of the copolymer and the value of the hydrophilic–lipophilic balance to accommodate the difference in aggregation effects.…”

Section: Introductionmentioning

confidence: 99%

Comb‐like polymer with sulfo groups and its dispersion and rheological properties in aqueous ceramic suspensions

Zhu

Fang

Min

et al. 2016

J of Applied Polymer Sci

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Two types of new comb-like polymers were formed as dispersants for aqueous ceramic suspensions with isoprenyloxy poly(ethylene glycol ether), acrylic acid, maleic anhydride as the main starting materials. During the synthesis, one comb-like polymer introduced sodium methylallyl sulfonate (SMAS) into the reaction media, whereas the other did not. The chemical structure and molecular weight were characterized by Fourier transform infrared spectroscopy and gel permeation chromatography. The effects of the polymers on the dispersion, f potential and rheological properties of the kaolin suspensions are discussed in detail. The results indicate that SMAS facilitated chain transfer, controlled the effective charge density of the surface, and increased the electrostatic repulsion force. The kaolin suspensions displayed shear-thinning behavior on the basis of the electrostatic and steric effects of the comb-like polymers. The apparent viscosity decreased from 1088 to 258 mPa s with the assistance of the SMAS-prepared comb-like polymer as a dispersant.

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Structure and Characterization of Sulfated Chitosan Superplasticizer

Cited by 12 publications

References 17 publications

Regulating the arm structure of star‐shaped polycarboxylate superplasticizers as a means to enhance cement paste workability

Regulating the arm structure of star‐shaped polycarboxylate superplasticizers as a means to enhance cement paste workability

Concreto de cimento Portland dopado com quitosana: propriedades mecânicas e microestrutural

Comb‐like polymer with sulfo groups and its dispersion and rheological properties in aqueous ceramic suspensions

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