Effect of the length of the side chains of comb-like copolymer dispersants on dispersion and rheological properties of concentrated cement suspensions

Ran, Qianping; Somasundaran, P.; Miao, Changwen; Liu, Jiaping; Wu, Shishan; Shen, Jian

doi:10.1016/j.jcis.2009.04.057

Cited by 200 publications

(122 citation statements)

References 22 publications

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“…Details of the preparation procedure and characterization methods were described elsewhere. 4,7) In this study, a series of comb-like copolymers with different graft densities and the same length of side chain have been chosen and tested. The grafting density of the copolymer can be set by simply choosing the appropriate mixing molar ratio between sodium acrylate (SAA) and methoxy poly(ethylene oxide)-acrylate (MPEGAA).…”

Section: Comb-like Copolymer Dispersantsmentioning

confidence: 99%

Effects of Grafting Densities of Comb-Like Copolymer on the Dispersion Properties of Concentrated Cement Suspensions

Liu¹,

Ran

Miao³

et al. 2012

Mater. Trans.

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Effects of grafting densities of comb-like copolymer on the dispersion properties of concentrated cement suspensions are investigated systemicly in this paper. For comb-like copolymers the adsorbed amount increases at the same dosages as the grafting density decreases, while the efficiency of dispersion is improved by increasing the grafting densities. Based on the theory of Flatt at level of scaling law, the molecule size and the occupied surface area of the comb-like polymers with different grafting densities are calculated. The comb-like polymers with higher grafting density has bigger molecular size. For comb-like polymer dispersant, the steric repulsion provided by the side chains is the main drive of the dispersion, so the Flory energy is employed to explore the relationship between steric repulsion and grafting density. The calculation tells us that higher grafting density results in higher Flory energy which represents stronger steric repulsion. The calculation method based on the scaling law and Flory theory is successfully used to interpret the dispersion mechanism, and it is anticipated that this method can be applied to explain the effect of other parameters of PCE comb-like polymers on the dispersion properties of cement suspensions, ceramics suspensions, slurries and so on.

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Section: Comb-like Copolymer Dispersantsmentioning

confidence: 99%

Effects of Grafting Densities of Comb-Like Copolymer on the Dispersion Properties of Concentrated Cement Suspensions

Liu¹,

Ran

Miao³

et al. 2012

Mater. Trans.

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“…Para NF, V y M, la energía potencial de interacción total ha sido calculada utilizando dos modelos: (a) considerando la repulsión electrostática despreciable (Ecuación [8]) y (b) considerando dicha repulsión electrostática (ecuación [9]):…”

Section: Modelización De Las Fuerzas De Dispersión Mediante El Prograunclassified

“…For NF, V and M admixtures, the total interaction potential energy has been calculated using two models: (a) considering the electrostatic repulsion negligible (equation [8]) and (b) taking it into account (equation [9]) (9):…”

Section: Modelling Of Dispersion Forces By Hamaker Softwarementioning

confidence: 99%

“…V T = V vdw + V elect +V steric [9] De esta forma se tiene en cuenta la distribución de tamaño de los polímeros, de forma que, como se ha visto en trabajos anteriores, las moléculas más grandes tienden a dominar la repulsión estérica (28). A grandes distancias todos los aditivos muestran un mínimo de atracción, pero el valor de dicho mínimo así como la distancia de separación a la que se observan dependen del tipo de aditivo superplastificante.…”

Section: Modelling Of Dispersion Forces By Hamaker Softwareunclassified

“…By dispersing agglomerated particles or flocs, the water retained in the flocs is released, enhancing flowability by modifying the effective solids volume fraction (1,3). Previous studies have suggested that for naphtalene-based or melamine-based admixtures the main dispersion mechanism is electrostatic repulsion, while for polycarboxylate-based admixtures, the electrostatic repulsion is accepted to be small and the main dispersion mechanism is steric repulsion (6)(7)(8)(9).…”

Section: Introductionmentioning

confidence: 99%

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Fuerzas de repulsión de aditivos superplastificantes en sistemas de escoria granulada de horno alto en medios alcalinos, desde medidas de AFM a propiedades reológicas

Palacios¹,

Bowen²,

Kappl³

et al. 2012

Mater. construcc.

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Comb‐Like Polymers

Wang

et al. 2017

Encyclopedia of Polymer Science and Technology

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Comb‐like polymers, as a kind of special graft polymers, have attracted interests due to their predetermined molecular structure and selected functionality. By controlling the structural composition of comb‐like polymers—such as the rigidity of polymer backbone, the length‐scale and the topological structure of the side chains—some interesting properties can be manipulated, and the transformation from passive to intelligent response is well approached. The incompatible polymeric main chain and side chain in comb‐like polymers contribute to novel hierarchical architectures and topologies, which exhibit various applications in textile, chemistry, proton conduction, waste treatment, and electronic fields. A deep understanding of the hierarchical structure and the assembled morphologies is helpful in achieving high‐performance functional materials used in the fabrication of microelectronic devices, microchip cooling, and so on. Herein, we review the recent progress on comb‐like polymers and highlight their fabrication, structure, and property, especially from the viewpoint of crystallization, phase transition, and thermal behavior.

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Effect of the length of the side chains of comb-like copolymer dispersants on dispersion and rheological properties of concentrated cement suspensions

Cited by 200 publications

References 22 publications

Effects of Grafting Densities of Comb-Like Copolymer on the Dispersion Properties of Concentrated Cement Suspensions

Effects of Grafting Densities of Comb-Like Copolymer on the Dispersion Properties of Concentrated Cement Suspensions

Fuerzas de repulsión de aditivos superplastificantes en sistemas de escoria granulada de horno alto en medios alcalinos, desde medidas de AFM a propiedades reológicas

Comb‐Like Polymers

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