Surface Tension, Density and Viscosity Studies on the Associative Behaviour of Oxyethylene-Oxybutylene Diblock Copolymers in Water at Different Temperatures
| العنوان: | Surface Tension, Density and Viscosity Studies on the Associative Behaviour of Oxyethylene-Oxybutylene Diblock Copolymers in Water at Different Temperatures |
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| المؤلفون: | Abbas Khan, Iram Bibi, Seemab Pervaiz, Khalid Mahmood, Mohammad Siddiq |
| المصدر: | International Journal of Organic Chemistry. :82-92 |
| بيانات النشر: | Scientific Research Publishing, Inc., 2012. |
| سنة النشر: | 2012 |
| مصطلحات موضوعية: | Surface tension, symbols.namesake, Materials science, Gibbs isotherm, Partial specific volume, Thermodynamics of micellization, Enthalpy, symbols, Thermodynamics, Flory–Huggins solution theory, Micelle, Gibbs free energy |
| الوصف: | The associative properties of methoxy (CH3O-) ended E58B11 and hydroxyl (-OH) ended E56B19 oxyethylene-oxybuty- lene diblock copolymers in aqueous solution at different temperature are reported in this paper. For both copolymers, E represents an oxyethylene (-[CH2CH2O]-) unit and B an oxybutylene (-[CH(C2H5)CH2O]-) unit while the subscripts denote the number average block length. Surface tension measurements were used to find out surface excess concentrations (Γm), area per molecule (αs1 ) at air/water interface and Gibbs free energy for adsorption (△G0ads ) for the pre-micellar region at four temperatures. Likewise thermodynamic parameters of micellization such as, critical micelle concentrations (CMC), enthalpy of micellization (△H0mic ), standard free energy of micellization (△G0mic) and entropy of micellization (△S0mic ), were also obtained using surface tension measurements. Solution densities were used to deter-mine the partial specific volume of micelle ( Vmic) and micellar density (ρmic). Dilute solution viscosities have been used to estimate the intrinsic viscosities [η], solute-solvent interaction parameter (KH) and hydration value of micelle (Wh) at various temperatures. The effect of temperature on the micelle properties is also discussed. |
| تدمد: | 2161-4695 2161-4687 |
| URL الوصول: | https://explore.openaire.eu/search/publication?articleId=doi_________::0162a0339915bfe8eabb29a3792aa977 https://doi.org/10.4236/ijoc.2012.21014 |
| حقوق: | OPEN |
| رقم الأكسشن: | edsair.doi...........0162a0339915bfe8eabb29a3792aa977 |
| قاعدة البيانات: | OpenAIRE |
| تدمد: | 21614695 21614687 |
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