Influence of adsorbed and nonadsorbed polymer additives on the viscosity of magnesium oxide suspensions

被引：7

作者：

Murray, Lisa R. ^{[1
,3
]}

Bice, Jason E. ^{[1
]}

Soltys, Emily G. ^{[1
,3
]}

Perge, Christophe ^{[2
]}

Manneville, Sebastien ^{[2
]}

Erk, Kendra A. ^{[1
]}

机构：

[1] Purdue Univ, Sch Mat Engn, 701 West Stadium Ave, W Lafayette, IN 47907 USA

[2] Univ Lyon, Univ Claude Bernard, CNRS, Ens Lyon,Lab Phys, F-69342 Lyon, France

[3] Anton Paar USA, 10215 Timber Ridge Dr, Ashland, VA 23005 USA

来源：

JOURNAL OF APPLIED POLYMER SCIENCE | 2018年 / 135卷 / 03期

基金：

美国国家科学基金会; 欧洲研究理事会;

关键词：

adsorption; ageing; rheology; POLY(ETHYLENE OXIDE); DEPLETION; RHEOLOGY; BEHAVIOR; ADSORPTION; FLOW; SUPERPLASTICIZERS; DYNAMICS; LAYER;

D O I：

10.1002/app.45696

中图分类号：

O63 [高分子化学（高聚物）];

学科分类号：

070305 ; 080501 ; 081704 ;

摘要：

Adsorbed polymer additives have been employed to reduce water content and improve cement workability through lowering viscosity, but the influence of over-dosage and the presence of nonadsorbed chains have yet to be fully understood. Model magnesium oxide (MgO) suspensions were used to investigate the potential processing effect of free chain concentration on cementitious mixtures. The rheological impact of the free chains was measured through incorporation of nonadsorbing poly(ethylene glycol) (PEG) to suspensions stabilized with an adsorbed comb-polymer superplasticizer. Analyses of the rheological data, that showed viscosity-increases and viscosity-reduction due to free PEG concentrations revealed a transition from depletion flocculation to depletion stabilization that contributed to the flow properties of the suspensions. The viscosity-reduction observed for high concentrations of free chains may be useful for improved mixing of cements with free polymer in addition to the adsorbed polycarboxylate ether-based superplasticizer. Additionally, the influence of free PEG on the macroscale flow behavior was also examined through local velocity measurements under shear. (c) 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018, 135, 45696.

引用

页数：9

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