Ternary Systems Containing an Acidic Copolymer, a Basic Copolymer, and a Solvent. 1. Phase Equilibria

Djadoun, Saïd; Goldberg, Robert N.; Morawetz, Herbert

doi:10.1021/ma60059a026

Cited by 49 publications

(19 citation statements)

References 2 publications

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“…We use the structure factors to study the stability of the polyelectrolyte mixture and compare our results to the experimental work of Djadoun et al [3] mentioned in the introduction. We use the structure factors to study the stability of the polyelectrolyte mixture and compare our results to the experimental work of Djadoun et al [3] mentioned in the introduction.…”

Section: Inverse Structure Factor Matrixmentioning

confidence: 95%

“…The physical origin of the segregation of the polymers is their low mixing entropy of order 1/N , where N is the number of monomers per chain, which cannot overcome any weak enthalpic interaction. Such experiments have been performed by Djadoun et al [3] by mixing acidic and basic copolymers. The chemical mismatch between two polymers is measured by a Flory-Huggins parameter χ AB that gives the contribution to the free energy, F enthalpic = kT χ AB φ A φ B , where the monomer concentrations of polymers A and B are denoted by φ A and φ B .…”

Section: Introductionmentioning

confidence: 99%

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Untitled

2001

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We consider the phase behavior of polymeric systems by calculating the structure factors beyond the Random Phase Approximation. The effect of this correction to the mean-field RPA structure factor is shown to be important in the case of Coulombic systems. Two examples are given: simple electrolytes and mixtures of incompatible oppositely charged polyelectrolytes. In this last case, all former studies predicted an enhancement of compatibility for increasing charge densities; we also describe the complexation transition between the polyelectrolytes. We determine a phase diagram of the polyelectrolyte mixture that includes both complexation and incompatibility.

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Section: Inverse Structure Factor Matrixmentioning

confidence: 95%

Section: Introductionmentioning

confidence: 99%

Untitled

2001

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“…In multicomponent polymer systems, the boundary between two‐ and single‐phase regions can be experimentally established from cloud‐point,10 critical‐point,11, 12 spinodal‐curve,12 or coexistence‐curve13, 14 measurements. As compatibility of polymers in solution is a rare occurrence,15 several authors proposed a method for increasing the compatibility of polymers, which consists in introducing interacting polar groups into the polymeric chain 15–17. These groups increase polymer compatibility in organic solution; usually these groups induce the formation of hydrogen bonding interactions 15, 18–20.…”

Section: Introductionmentioning

confidence: 99%

Treatment of poly(styrene‐co‐methacrylic acid)/poly(4‐vinylpyridine) blends in solution under liquid–liquid phase‐separation conditions. A new method for phase‐separation data attainment from viscosity measurements

Torrens¹,

Soria²,

Monzó³

et al. 2006

J of Applied Polymer Sci

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Phase diagrams are contributed for polymer mixture systems in solution. One polymer has protonacceptor character and the other has growing proton-donor nature, which is reflected in the phase diagrams. Usually, these diagrams are obtained from size-exclusion chromatographic (SEC) measurements. A totally novel application, which is exposed in this report, is the construction of the phase diagram from the viscometric experiments of polymer mixtures. The evaluated binodal or cloud-point isotherms so built agree well with those from SEC. The results indicate an augmentation in the dimensions of donor polymer B, in the presence of acceptor polymer C, intensifying with the concentration of C, which is interpreted as an B-C association growing as the number of hydrogen bonds increases. An increment in the Huggins constant for BC, as the proportion of methacrylic acid in the donor copolymer increases, means an augmentation in the interaction for BC, indicating an extension of compatibility. Viscometric experiments evidence hydrogen bonds, intensifying as greater proportion of donor groups has polymer B, equal to that observed in the phase diagrams.

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“…Miscibility enhancement in polymers has been an active field of research in the past 2 decades, and many enhancement techniques have been used. [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15] Ionic interactions have received special attention as a particularly efficient method of miscibility enhancement in several highly dissimilar systems. 16 -20 In some cases, miscibility has been due to a proton transfer from an acidic site on one polymer to a basic site on another, leading to ion-ion interactions.…”

Section: Introductionmentioning

confidence: 99%

Miscibility behavior and coil overlap in ionic blends of phenylated polytriphenylene oxide and poly(methyl methacrylate)

Rajagopalan

Natansohn

Eisenberg

et al. 2003

J of Applied Polymer Sci

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ABSTRACT:Blends of sulfonated phenylated polytriphenylene oxide and poly(methyl methacrylate-co-4-vinyl pyridine) were examined by dynamic mechanical, Fourier transform infrared, and NMR techniques. A high degree of miscibility was evident from a single drop in a plot of the storage modulus versus the temperature. The presence of ionic moieties due to proton transfer from sulfonic acid to 4-vinyl pyridine was confirmed by both NMR and IR spectroscopy studies. The coils were found to be close to one another in dimethyl sulfoxide-d 6 because the aromatic shielding effect of the phenyl rings of the phenylated polytriphenylene oxide units was observed from the upfield shift of most of the protons of poly(methyl methacrylate) in the NMR spectrum. However, the absence of cross peaks in the nuclear Overhauser and exchange spectroscopy experiments suggested that the intermolecular distance between the chains had to be larger than 4 Å.

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Ternary Systems Containing an Acidic Copolymer, a Basic Copolymer, and a Solvent. 1. Phase Equilibria

Cited by 49 publications

References 2 publications

Untitled

Untitled

Treatment of poly(styrene‐co‐methacrylic acid)/poly(4‐vinylpyridine) blends in solution under liquid–liquid phase‐separation conditions. A new method for phase‐separation data attainment from viscosity measurements

Miscibility behavior and coil overlap in ionic blends of phenylated polytriphenylene oxide and poly(methyl methacrylate)

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