Rheological behavior of PMVE-MA aqueous solution with metallic cations

doi:10.1007/s11705-010-0548-z

Front Chem Sci Eng

2011, Vol. 5

Issue (1) : 126-130 https://doi.org/10.1007/s11705-010-0548-z

RESEARCH ARTICLE

Rheological behavior of PMVE-MA aqueous solution with metallic cations

Xiaoping DONG, Li LI(

), Jun XU, Xuhong GUO

State Key Laboratory of Chemical Engineering, East China University of Science and Technology, Shanghai 200237, China

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Abstract

The rheological properties of aqueous solutions of poly(methyl vinyl ether-co-maleic anhydride) (PMVE-MA) upon addition of metallic cations at different pH values were investigated. Sol-gel transition and shear-thickening phenomena at moderate shear rate were observed upon increasing the amount of metallic cations, especially for cupric cation. At certain molar ratio (f_gel) of added cupric cations to carboxyl groups in PMVE-MA, the system became gel-like, and the storage modulus (G′) and loss modulus (G′′) were parallel and exhibited a power-law dependence on the frequency, which is consistent with Winter’s hypothesis of determining the gel point of a crosslinking system. The shear-thickening behavior depends on f_gel, pH, metallic valence, and temperature.

Keywords poly(methyl vinyl ether-co-maleic anhydride) shear-thickening gel point rheology

Corresponding Author(s): LI Li,Email:lili76131@ecust.edu.cn

Issue Date: 05 March 2011

Cite this article:

Xiaoping DONG,Li LI,Jun XU, et al. Rheological behavior of PMVE-MA aqueous solution with metallic cations[J]. Front Chem Sci Eng, 2011, 5(1): 126-130.

URL:

https://academic.hep.com.cn/fcse/EN/10.1007/s11705-010-0548-z
https://academic.hep.com.cn/fcse/EN/Y2011/V5/I1/126

Fig.1 Viscosity as a function of shear rate. The changing parameter is molar ratio of cupric ions to carboxyl groups in 2 wt-% Gantrez solution with pH= 5

Fig.2 Elastic modulus G′ and viscous modulus G′′ as a function of frequency. The changing parameter is molar ratio of cupric ions to carboxyl groups in 2 wt-% Gantrez solution with pH= 5

Fig.3 Viscosity as a function of shear rate. The changing parameter is molar ratio of cupric ions to carboxyl groups in 2 wt-% Gantrez solution with pH= 7

Fig.4 Elastic modulus G′ and viscous modulus G′′ as a function of frequency. The changing parameter is molar ratio of cupric ions to carboxyl groups in 2 wt-% Gantrez solution with pH= 7

Tab.1 Critical parameters at gel point for samples at different pH

Fig.5 Schematic description of the mechanism of shear-thickening behavior

Fig.6 Viscosity as a function of shear rate. The changing parameter is the valence of metallic cations. The concentration of Gantrez solution is 3 wt-% and pH= 5

Fig.7 Viscosity as a function of shear rate in 2 wt-% Gantrez solution. The ratio of Cu to COOH is 0.033 at pH= 5. The changing parameter is temperature

Fig.8 Viscosity as a function of shear rate in 2 wt-% Gantrez solution with Cu/COOH= 0.033. The changing parameter is pH value

Fig.9 Elastic modulus G′ and viscous modulus G′′ as a function of frequency. The changing parameter is pH in 2 wt-% Gantre solution with Cu/COOH= 0.033

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