A volumetric study of aqueous solutions of poly(ethylene glycol)s at 298.15 K

Kirinčič, Stanislava; Klofutar, Cveto

doi:10.1016/s0378-3812(98)00369-0

Cited by 60 publications

(51 citation statements)

References 27 publications

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“…As concerns the copolymers, they are in a good agreement with those reported elsewhere. 17,18 Whenever it is possible to make comparison, the V o P values of homopolymers agree with the literature data; 19 moreover, their values are consistent with those calculated by the additivity using the EO and PO contributions. 20 The mixtures were prepared by using water from reverse osmosis (Elga model Option 3) having resistivity higher than 1 MO cm…”

supporting

confidence: 86%

Adsorption of triblock copolymers and their homopolymers at laponite clay/solution interface. Role played by the copolymer nature

Lisi

Lazzara

Lombardo

et al. 2005

Phys. Chem. Chem. Phys.

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The adsorption thermodynamics of copolymers, based on ethylene oxide (EO) and propylene oxide (PO) units, at the laponite (RD) clay/liquid interface was determined at 298 K. The copolymer nature was tuned at molecular level by changing the hydrophilicity, the architecture and the molecular weight (Mw) keeping constant the EO/ PO ratio. Polyethylene (PEGs) and polypropylene (PPGs) glycols with varying Mw and their mixture were also investigated to discriminate the role of the EO and the PO segments in the adsorption process. Enthalpies of transfer of RD, at fixed concentration, from water to the aqueous macromolecule solutions as functions of the macromolecule molality were determined. They were treated quantitatively by means of a model based on two equilibria: (1) one-to-one binding between the macromolecule and the site on the solid and (2) two-to-one binding following which one macromolecule interacts with another one adsorbed onto the solid. The good agreement between the equilibrium constants obtained from calorimetry and those determined from kinetic experiments confirmed the reliability of the experimental and theoretical approaches. Almost all of the systems investigated are highlighted by the one-to-one binding; the L35 and 10R5 systems present both equilibria. The insights provided by the thermodynamics of adsorption of their homopolymers onto RD were fruitful in obtaining detailed information on the nature of the forces involved between RD and the copolymers. The data obtained in the present work clearly evidenced that for comparable polymer Mw, PPG is more suitable in building up a steric barrier around the RD particles and, indeed, exhibits several advantages and no drawbacks. Moreover, the parent copolymers may properly functionalize the RD surface by exploiting both their high affinity to the solid surface and the ability to self-assemble onto it as L35 and 10R5 clearly showed.

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supporting

confidence: 86%

Adsorption of triblock copolymers and their homopolymers at laponite clay/solution interface. Role played by the copolymer nature

Lisi

Lazzara

Lombardo

et al. 2005

Phys. Chem. Chem. Phys.

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“…The coefficients of equation (2) are given in table 2. The infinite dilution-apparent specific volume of PEO in pure water at T = 298.15 K reported in the literature [13][14][15] is compared with our results in table 3. A similar comparison at other temperatures and also in aqueous salt solutions cannot be made at this time since these data are lacking in the literature.…”

Section: Volumetric Propertiessupporting

confidence: 53%

Effect of sodium phosphate salts on the thermodynamic properties of aqueous solutions of poly(ethylene oxide) 6000 at different temperatures

Sadeghi

Hosseini

Jamehbozorg

2008

The Journal of Chemical Thermodynamics

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“…Many research groups have focused their attention to obtain information on the thermodynamics of aqueous polyethylene glycol (PEG), which is often used in biotechnology. In this respect, thermodynamic properties such as vapour + liquid equilibria, density and viscosity have been obtained [1][2][3]. However, similar information on the thermodynamics of aqueous solutions of polyvinylpyrrolidone (PVP), which is also a very important system in respect to its use in biotechnology, is scarce.…”

Section: Introductionmentioning

confidence: 99%