Modeling osmotic pressure second virial and preferential adsorption coefficient data of ternary solvent-polymer-solvent systems using equation-of-state solution theories

Wedgeworth, John B.; Glover, Charles J.

doi:10.1021/ma00175a036

Cited by 7 publications

(1 citation statement)

References 9 publications

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“…The magnitude of the attraction (approximately 100 µ -m"1) is even similar to that predicted by theories which do not explicitly bring bridging into the model.5"9 In fact, as noted above, these experiments were performed in ternary solution (95% cyclopentane), not the binary solution of theoretical models.5"9 Ternary solutions are poorly understood and are difficult to characterize even in the isotropic state. 26 However, the present system is particularly simple considering that it is ternary. Linear and cyclic pentanes may be expected to mix quasi-ideally and to have similar surface interaction parameters,7 but cyclopentane is the far better solvent for PS.…”

Section: Resultsmentioning

confidence: 99%

Influence of solvent quality on surface forces between polystyrene layers adsorbed onto mica

Hu¹,

Alsten²,

Granick³

1989

Langmuir

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Force-distance profiles were strikingly sensitive to small differences in temperature and solvent composition. Surfaces forces were measured at 18 and 28 °C between mica surfaces bearing polystyrene (Mw = 490000 g-mol'1) adsorbed from dilute cyclopentane solution ( temperature TQ = 19.5 °C). Forces at long range were monotonically repulsive at 28 °C and mildly attractive at 18 °C provided that a cyclopentane containing 5% linear pentanes was used. This contrasts with experiments in 99% pure cyclopentane, in which the range of detectable forces was (2-3)Rq (unperturbed radius of gyration) at 18 °C and (5-6)Rq at 28 °C, and the forces at long range were strongly attractive at 18 °C and weakly attractive even at 28 °C. A change of sign of the long-range interactions between adsorbed homopolymers, over a small range of temperature, does not appear to have been reported previously.

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Section: Resultsmentioning

confidence: 99%

Influence of solvent quality on surface forces between polystyrene layers adsorbed onto mica

Hu¹,

Alsten²,

Granick³

1989

Langmuir

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Preferential solvation of polystyrene by an excimer‐forming fluorophore in the system polystyrene/cyclohexane

et al. 1989

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Fluorescence spectroscopy is used to study the preferential solvation of the polymer and the mobility of the fluorophore in the highly diluted ternary system polystyrene/ethyl l-naphthoate/cyclohexane under theta-conditions. The ratio of the excimer to monomer fluorescence intensity Zac/Zmoo of the fluorophore is correlated with the concentration and the mobility of the fluorophore in the two phases, inside and outside the polymer coil; the limits of this model are discussed in detail. In the selected system preferential solvation increases the Z, / Z, , , ratio whereas the reduced mobility of the fluorophore inside the coil acts in the opposite manner. The model allows to calculate the distribution coefficient K for the distribution of the fluorophore between the two phases and the ratio q of the mobilities for the fluorophore in the two phases. The values of K obtained indicate a strong preferential solvation of polystyrene by the ethyl 1-naphthoate fluorophore. The mobility ratio q depends on the molar mass of the polymer in such a way that it reflects segmental density.

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Some observations on the behaviour of the thermodynamic interaction parameter in dilute polymer solutions

Dijk

Wakker

1993

Polymer

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Modeling osmotic pressure second virial and preferential adsorption coefficient data of ternary solvent-polymer-solvent systems using equation-of-state solution theories

Cited by 7 publications

References 9 publications

Influence of solvent quality on surface forces between polystyrene layers adsorbed onto mica

Influence of solvent quality on surface forces between polystyrene layers adsorbed onto mica

Preferential solvation of polystyrene by an excimer‐forming fluorophore in the system polystyrene/cyclohexane

Some observations on the behaviour of the thermodynamic interaction parameter in dilute polymer solutions

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