The properties of water in swollen cross-linked polystyrene sulfo acids

Gagarin, A. N.; Tokmachev, M. G.; Kovaleva, S. S.; Ferapontov, N. B.

doi:10.1134/s0036024408110137

Cited by 7 publications

(3 citation statements)

References 2 publications

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“…In order to gain some insight into this difference water sorption isotherms for H-GO and H-GOm membrane were measured at ambient temperature (T=298±5K) by ISP (see Table 2) and for H-GO additionally by DDM method (see Figure 3). carbons sorbing same amount of water [39] where such saturation is usually reached at RH≈0.8, yet it's similar in appearance to typical isotherms for swelling polymers [31,40]. As it is seen from Table 2, the results obtained for H-GO and H-GOm membrane at RH<0.75 coincide within the limits of experimental error.…”

Section: Water Sorption Isotherms For H-go and H-gomsupporting

confidence: 74%

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Sorption of polar organic solvents and water by graphite oxide: Thermodynamic approach

Korobov

Talyzin

Ребрикова

et al. 2016

Carbon

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Sorption of polar organic solvents CH 3 OH, C 4 H 8 O (THF), CH 3 CN, C 3 H 7 NO (DMF) , C 2 H 6 OS (DMSO), C 5 H 9 NO (NMP) and water was quantitatively evaluated for Hummers (H-GO) and Brodie (B-GO) graphite oxides at T=298K and at melting temperature (Tm) of the solvents. H-GO showed stronger sorption compared to B-GO for all studied solvents and the increase of sorption upon lowering temperature was observed for both H-GO and B-GO. Thermodynamic equations allowed to explain earlier reported "maximums" of swelling/sorption in the binary systems H-GO -solvent at Tm. The specific relation between the values of enthalpies of sorption and melting leads to the change of sign in enthalpies of sorption at Tm and causes maximal swelling/sorption. The same thermodynamic explanation was given for the "maximum" on the swelling vs. pressure dependence in B-GO and H-GO -H 2 O systems earlier reported at pressure of phase transition "liquid water-ice VI". Notably higher sorption of H 2 O was observed for H-GO compared to H-GO membrane (H-GOm) at high relative humidity (RH), RH>0,75. Experimental sorption isotherm of H-GOm was used to simulate permeation rates of water through H-GOm and to estimate effective diffusion coefficient of water through the membrane.

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Section: Water Sorption Isotherms For H-go and H-gomsupporting

confidence: 74%

“…Dynamic desorption measurements (DDM) were performed on the instrument described in ref. [31]. In the experiment the rate of continuous desorption of water under equilibrium conditions was measured.…”

Section: Water Sorption Isotherms For H-go and H-gom Were Obtained Bymentioning

confidence: 99%

Sorption of polar organic solvents and water by graphite oxide: Thermodynamic approach

Korobov

Talyzin

Ребрикова

et al. 2016

Carbon

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“…A substantial corroboration of our above findings concerning the multiplicity of the swollen polymer/saturated vapor equilibrium states as well as our explanations of this paradox came from recent results of elegant and precise experiments by Gagarin [21,36]. By applying "dynamic desorption porometry" technique developed by Schkolnikov and Volkov [37], Gagarin unexpectedly found the rate of evaporation of water from ultimately swollen hydrophilic gel-type polymers to remain maximum and constant within the whole range between the waterswollen and saturated vapor-swollen states.…”

Section: Nature Of Swelling Of Polymer Networksupporting

confidence: 87%

Swelling of Crosslinked Polymers in Liquids and Vapors. Rational Explanation of Thermodynamic Paradoxes

Davankov

Пастухов

2014

Zeitschrift Für Physikalische Chemie

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Schroeder's paradox, stronger swelling of gelatin in liquid water compared to swelling in saturated water vapor, did not receive any acceptable thermodynamic explanation for more than 100 years. By an automatic registration of the growing size of a single polymeric sphere (of less than 1 mm in diameter) placed first into saturated vapor atmosphere and then into corresponding liquid, we showed that the above effect is a general phenomenon characteristic of all crosslinked polymers and all types of aqueous or organic media. Explanation of the paradox is presented in terms of higher activity and chemical potential of the bulk liquid compared to saturated vapor over it, due to the unidirectional attraction of the surface molecules toward the condensed liquid phase. Also, it was found that saturated vapor can exist in a prolonged equilibrium with polymer samples which incorporate any amount of the sorbate within the broad range from the vapor-equilibrated to liquid-equilibrated extremes. This paradox is explained by the dependence of the system of inter-chain interactions within the network on the pre-history of the sample.

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