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• W3176899930 endingPage "2975" @default.
• W3176899930 startingPage "2959" @default.
• W3176899930 abstract "Thermophysical properties and phase behavior of seven {polymer (1) + water (2)} systems were determined using PPG400, Ultraric PE62, Pluronic L64, Pluronic L35, PEG400, PEG600, and PEG1000. Density (ρ) and refractive index (n) were measured for the whole range of w1 at T = 293.2 K. Correlation with Redlich–Kister equation and prediction with Lorentz–Lorenz theoretical model were done. pH was measured for different mass fractions at ambient temperature (T ≈ 298.2 K). Cloud point temperature (Tcloud) was measured for different polymer mass fractions (w1) from 0.02 up to 0.30. The thermal expansion coefficient (αT) was calculated for w1 = 0.15 and temperature (T) from 278.2 up to 348.2 K. Experiments were conducted at atmospheric pressure (P ≈ 95 kPa). The obtained thermophysical properties indicate that PEGs + water have the highest ρ while PPG400 + water has the smallest ρ. Also, all ρ vs w1 curves present a maximum value. n profiles are similar for all systems, showing the same refractive index increment for w1 below 0.4. Density (Δρ) and refractive index (Δn) deviations are higher for the PPG400 + water system, mainly due to the highest propylene content and hydrophobic character of PPG units. Moreover, pH varies with polymer mass fraction reaching a minimum value, probably because polymers release H+ in solution. Phase transition results indicate that Tcloud and αT present related behaviors, i.e., when solution became turbid, αT shows an abrupt change in slope." @default.
• W3176899930 created "2021-07-05" @default.
• W3176899930 creator A5011764705 @default.
• W3176899930 creator A5029028410 @default.
• W3176899930 creator A5052434216 @default.
• W3176899930 creator A5063016208 @default.
• W3176899930 date "2021-06-30" @default.
• W3176899930 modified "2023-10-18" @default.
• W3176899930 title "Density, Refractive Index, pH, and Cloud Point Temperature Measurements and Thermal Expansion Coefficient Calculation for PPG₄₀₀, PE62, L64, L35, PEG₄₀₀, PEG₆₀₀, or PEG₁₀₀₀ + Water Systems" @default.
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