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- W2360376989 abstract "It is considered that the hydrophobical association of hydrophobically associating polymers in aqueous solutions proceeds in two stages: the intra- and intermolecular association take place and result in increase in slope of viscosity-concentration curves when the polymer concentration is higher than the 1st critical associating concentration, CAC_1; the intramolecular association causing solution viscosity reduction reaches its equilibrium at the 2nd critical associating concentration, CAC_2, and beyound this concentration the intermolecular association occurs mainly and the slope of viscosity-concentration curves become steeper again. The values of CAC_1 and CAC_2 are determined from viscosity-concentration curves for 3 commercial polymers and the effects of a lot of factors are investigated. CAC_1 and CAC_2 values decrease nearly linearly with increasing pH value in range 4.8-8.2, increase with increasing salinity in range 1.0-100 g/L, slightly increase with increasing temperature in range 20-50℃ and keep unchanged with increasing shear rate in rang 32-103 s~(-1). For solution of polymer S3 (M=1.28×10~7 and HD=29.3%), introducing a heavy alkyl benzene sulfonate of dosage 6.0 g/L (in concentration range of viscosifying peak of the polymer solution) results in decrease in CAC_1 and CAC_2 values from 970 and 2140 mg/L to 567 and 1100 mg/L, respectively. The effects of salinity, anionic surfactant and other factors on hydrophobical association are discussed." @default.
- W2360376989 created "2016-06-24" @default.
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- W2360376989 date "2004-01-01" @default.
- W2360376989 modified "2023-09-25" @default.
- W2360376989 title "A Study on Critical Associating Concentrations of Water Soluble Hydrophobically Associating Polymers for EOR" @default.
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