Rheological Behavior of Binary Aqueous Solutions of Poly(ethylene glycol) of 1500 g路mol鈥? as Affected by Temperature and Polymer Concentration

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• 作者：Bernardo de S谩 Costa ; Jane S茅lia dos Reis Coimbra ; M谩rcio Ar锚des Martins ; Edwin Elard Garcia-Rojas ; Javier Telis-Romero ; Eduardo Bas铆lio De Oliveira
• 刊名：Journal of Chemical & Engineering Data
• 出版年：2013
• 出版时间：April 11, 2013
• 年：2013
• 卷：58
• 期：4
• 页码：838-844
• 全文大小：350K
• 年卷期：v.58,no.4(April 11, 2013)
• ISSN：1520-5134

文摘

The rheological behavior of poly(ethylene glycol) of 1500 g路mol^鈥?(PEG1500) aqueous solutions with various polymer concentrations (w = 0.05, 0.10, 0.15, 0.20 and 0.25) was studied at different temperatures (T = 283.15, 288.15, 293.15, 298.15 and 303.15) K. The analyses were carried out considering shear rates ranging from (20 to 350) s^鈥?, using a cone-and-plate rheometer under controlled stress and temperature. Classical rheological models (Newton, Bingham, Power Law, Casson, and Herschel鈥揃ulkley) were tested. The Power Law model was shown suitable to mathematically represent the rheological behavior of these solutions. Well-adjusted empirical models were derived for consistency index variations in function of temperature (Arrhenius-type model; R² > 0.96), polymer concentration (exponential model; R² > 0.99) or the combination of both (R² > 0.99). Additionally, linear models were used to represent the variations of behavior index in the functions of temperature (R² > 0.83) and concentration (R² > 0.87).