Heat of dilution of aqueous solutions of sodium salts of partially sulphonated polystyrenes

1976 ◽  
Vol 72 (0) ◽  
pp. 504 ◽  
Author(s):  
Kazuei Mita ◽  
Tsuneo Okubo ◽  
Norio Ise
Keyword(s):  
Aqueous Solutions ◽  
Heat Of Dilution ◽  
Sodium Salts

Chaleur de dilution de solutions aqueuses d'acide polyacrylique, de son sel de sodium et de l'acide propionique

1971 ◽  
Vol 49 (24) ◽  
pp. 3935-3939 ◽  
Author(s):  
Jean-Pierre Cartier ◽  
Hubert Daoust
Keyword(s):  
Aqueous Solutions ◽  
Propionic Acid ◽  
Polyacrylic Acid ◽  
Sodium Polyacrylate ◽  
Heat Of Dilution ◽  
Concentrated Solutions ◽  
Sodium Salts ◽  
Structure Of Water ◽  
Calvet Microcalorimeter ◽  
Heats Of Dilution

With a Tian–Calvet microcalorimeter, heats of dilution at 25 °C have been measured for aqueous and acid (0.2 N HCl) solutions of polyacrylic acid and of propionic acid, and for aqueous solutions of the sodium salts of polyacrylic acid. The results are interpreted in terms of the change in structure of water resulting from the lengthening of the solute molecule. The heat of dilution of moderately concentrated solutions of sodium polyacrylate can be explained by the theory of Eigen and Wicke.

scholarly journals COMPLEXATION OF POLYETHYLENE-GLYCOL WITH THE SODIUM SALTS OF CITRIC AND SUCCINIC ACIDS IN THE AQUEOUS SOLUTIONS. STUDIES BY DYNAMIC LIGHT SCATTERING AND UV/VIS SPECTROPHOTOMETRY

2015 ◽  
Vol 11 (8) ◽  
pp. 3866-3872
Author(s):  
E.A. Masimov ◽  
Etibar Hummat Ismailov ◽  
S.Y. Odzhaqverdiyeva
Keyword(s):  
Molecular Weight ◽  
Light Scattering ◽  
Dynamic Light Scattering ◽  
Aqueous Solutions ◽  
Polyethylene Glycols ◽  
Hydrodynamic Diameter ◽  
Absorption Bands ◽  
Sodium Salts ◽  
And Diffusion ◽  
Formation Of Complexes

Dynamic light scattering (DLS) method in combination with the UV/VIS spectrophotometry is used to study the interaction of polyethylene- glycols with a molecular weight  6000 ( PEG6000 ) with sodium salts of citric and succinic acids in aqueous solutions. The values of density, viscosity, refractive and diffusion indexes, the values of the hydrodynamic diameter, wavelength electronic absorption bands for PEG6000 aqueous solutions, their mixtures with succinic and citric acids are determined. It was shown that depending on the composition of the solutions the values of hydrodynamic diameter for aqueous solutions containing 1-5 wt.% PEG6000 and their mixtures with succinic and citric acids (~ 1 wt%) ranges from 3.6 to 5.2 nm. It is assumed that the formation of complexes with the sizes  that are within the above range is due to the features of interaction  and the structure of the complexes formed in solution.

scholarly journals Effect of sodium salts on diffusion of poly(vinyl alcohol) in aqueous solutions

2020 ◽  
Vol 304 ◽  
pp. 112728
Author(s):  
Barbora Filova ◽  
Lenka Musilova ◽  
Aleš Mracek ◽  
M. Luísa Ramos ◽  
Luis M.P. Veríssimo ◽  
...  
Keyword(s):  
Aqueous Solutions ◽  
Vinyl Alcohol ◽  
Poly Vinyl Alcohol ◽  
Sodium Salts

Chaleurs de dilution de solutions aqueuses d'acide polyméthacrylique et de ses sels de sodium et de rubidium

1976 ◽  
Vol 54 (12) ◽  
pp. 1853-1859 ◽  
Author(s):  
Hubert Daoust ◽  
Alain Lajoie
Keyword(s):  
Aqueous Solutions ◽  
Average Molecular Weight ◽  
Solute Concentration ◽  
Isobutyric Acid ◽  
Polymethacrylic Acid ◽  
Heat Of Dilution ◽  
Entire Concentration Range ◽  
Calvet Microcalorimeter ◽  
Heats Of Dilution ◽  
S Model

Heats of dilution of aqueous solutions of two polymethacrylic acid samples having a viscosity average molecular weight of 5000 (PMA-I) and 140 000 (PMA-II) respectively and of isobutyric acid (BA) have been measured at 25 °C using a Tian–Calvet microcalorimeter. The same measurements have been repeated in presence of HCl (0.2 N). Aqueous solutions of sodium and rubidium salts of PMA-I and II have also been investigated. Dilution of BA solutions is endothermic at high solute concentration and then becomes exothermic as concentration decreases and the presence of HCl does not affect the results. Dilution of PMA solutions is exothermic over the investigated concentration range in agreement with the results of Eliassaf and co-workers. PMA-I gives a more exothermic heat of dilution than PMA-II in the lower concentration range. The presence of HCl does not affect appreciably the results for PMA-II but it makes the dilution of PMA-I solutions less exothermic. The results are discussed in the light of Liquori et al.'s model for PMA chain which may adopt a globular or an extended solvated coil depending on solvent properties. Heats of dilution of aqueous solutions of sodium salts of both samples I and II are endothermic over the entire concentration range investigated whereas the heats of dilution of rubidium salts are exothermic.

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