The temperature dependence of the light scattering and viscosity of solutions of poly(methacrylic acid)

Kanevskaya, Ye.A.; Zubov, P.I.; Иванова, Л. В.; Lipatov, Yu.S.

doi:10.1016/0032-3950(64)90369-7

Cited by 9 publications

(11 citation statements)

References 9 publications

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“…A similar effect of poor solvent quality for PMAA is achieved by NaCl addition. Hence, theta conditions based on A 2 values were reported at T = 68 °C in 0.05 M NaCl and at T = 43 °C in 0.5 M NaCl 26…”

Section: Resultssupporting

confidence: 89%

The Chameleon‐Like Nature of Zwitterionic Micelles: The Effect of Ionic Liquid Addition on the Properties of Aqueous Sulfobetaine Micelles

et al. 2012

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We used fluorescence probing, ζ potentials, and dynamic light scattering measurements to study the interactions between the zwitterionic surfactant N-hexadecyl-N,N-dimethylammonio-1-propanesulfonate (SB-16) and three ionic liquids (ILs), 1-ethyl-3-methylimidazolium ethylsulfate ([C(2)mim][C(2)SO(4)]), 1-ethyl-3-methylimidazolium n-butylsulfate ([C(2)mim][C(4)SO(4)]), and 1-ethyl-3-methylimidazolium n-hexylsulfate ([C(2)mim][C(6)SO(4)]). The three ILs have the same cationic part and their anionic parts differ only in the length of the alkyl chain. The aim of our work is to offer a comparative study and establish the role of the alkyl chain length of the anion of ILs on 1) the incorporation of these anions in the zwitterionic micelles of SB-16 (selectivity of anions) and 2) the physicochemical properties of aqueous solutions of SB-16. Results show that, at lower concentrations (i.e. ≤20 mM), the different ILs modify the properties of the aqueous SB-16 solution in similar manner. All of them bring about a decrease in the critical micelle concentration (CMC) and also in size, and increase the aggregation number of the SB-16 micelles; these effects are more dramatic when [C(2)mim][C(6)SO(4)] is used as the additive rather than [C(2)mim][C(4)SO(4)] and [C(2)mim][C(2)SO(4)]. It is proposed that, in case of [C(2)mim][C(6)SO(4)], the presence of a hexyl chain on the hexylsulfate ion allows the ion to align itself with the tail part of SB-16, whereas, in the case of [C(2)mim][C(2)SO(4)], the presence of ethyl chain in the ethylsulfate ion is not sufficient to bring about a similar alignment of the ethylsulfate anion with the tail part of SB-16. This difference in the location of the anions of the ILs is responsible for the different behavior of the ILs.

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Section: Resultssupporting

confidence: 89%

The Chameleon‐Like Nature of Zwitterionic Micelles: The Effect of Ionic Liquid Addition on the Properties of Aqueous Sulfobetaine Micelles

et al. 2012

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“…In view of the high expansion factors for the highest fractions, it was not possible to choose the Stockmayer-Fixman extrapolation; instead, the Tanaka extrapolation was used (Eq. The characteristic ratio thus obtained, C = 12,0, is much lower than the value corresponding to the original Mark-Houwink equation for PMMA in methanol (C = 16, 9), but is in good agreement with the estimate made from data in ref.g) using the dimensionless parameter A, * M / [ q ] 3, line 1).…”

Section: Experimental Partsupporting

confidence: 86%

“…9) also suggest that at 25 "C methanol is a thermodynamically good solvent for PMAA. The molecular weight of sample B-lb was determined in methanol at 25 "C by Archibald's approach-to-equilibrium method in an analytical centrifuge Spinco E-HT (8766 -10 589 rotations per minute), concentration range 0,9.…”

Section: Experimental Partmentioning

confidence: 89%

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The characteristic ratio of poly(methacrylic acid) in organic solvents

1986

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Parameters of the Mark-Houwink equation for poly(methacry1ic acid) (PMAA) in methanol at 25 "C, [q] = 0,0224. M"9679,were determined and found to differ markedly from those reported earlier for 26 "C. The value of the exponent along with the high value of the second virial coefficient confirms that near to 25 "C methanol is not a theta-solvent for PMAA. By employing extrapolation according to Tanaka, the characteristic ratios C of PMAA in methanol (C = 12,O) and in 2-ethoxyethanol (C = 9,7) were determined from viscosity data at 25 "C. The unperturbed dimensions of PMAA depend on the solvent used. They are larger in organic solvents than in water, but the difference is not so high as assumed before. By using the Stockmayer-Fixman extrapolation, the characteristic ratio for PMAA in 2-ethoxyethanol was determined at 70 "C, i. e. at a temperature not too far from theta-conditions (0 = 65 "C, C = 8,2). A comparison with the value for 25 "C shows that the unperturbed dimensions of PMAA decrease with increasing temperature.

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“…In agreement with the LCST behavior, the heat effects accompanying the conformational transition of aPMA chain in dilute solutions increase (the process becomes more endothermic) with increasing temperature . Sedlák et al have shown that a rather concentrated aqueous aPMA solution is more or less insensitive to temperature at nonzero degree of ionization, while in solutions where ionization is completely suppressed, the LCST behavior of aPMA becomes pronounced and is shifted to lower temperatures with increasing HCl concentration. − For similar reasons, LCST of aPMA with degree of neutralization α N = 0 is shifted to lower values when the concentration of added salt (NaCl) is increased. , …”

Section: Introductionmentioning

confidence: 72%

Tacticity and Counterion Modulated Temperature Response of Weak Polyelectrolytes: The Case of Poly(methacrylic acid) Stereoisomers in Aqueous Solutions

Hriberšek

Kogej

2019

Macromolecules

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The temperature-induced formation of nanoparticles of two poly(methacrylic acid) (PMA) isomers, atactic (aPMA) and isotactic (iPMA), displays an opposite thermoresponsiveness. The formation of nanoparticles is investigated in dilute aqueous solutions in the presence of cations of different charge (Na + , Mg 2+ , and La 3+ ) first by UV spectroscopy and visual observations. In the aPMA case, aggregation and phase separation take place with increasing temperature, whereas with iPMA intermolecular associates gradually disintegrate upon heating the solutions; however, no macroscopic phase separation is observed, and the process is completely reversible. Stable associates exist in iPMA solutions at all temperatures if higher valency ions (Mg 2+ and La 3+ ) are present, whereas with aPMA, only La 3+ ions induce irreversible (stable) aggregation. Detailed structural characteristics of iPMA and aPMA aggregates are determined by dynamic and static light scattering and additionally characterized by pyrene fluorescence measurements, which reveal microgel-like nature of the aggregates. The observed opposite thermoresponsiveness is supported by calorimetric measurements. Behavior in PMA solutions of both isomers with added Mg 2+ ions is governed by strong hydration of Mg 2+ ions and by their monodentate binding mode to carboxylic groups on PMA.

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The temperature dependence of the light scattering and viscosity of solutions of poly(methacrylic acid)

Cited by 9 publications

References 9 publications

The Chameleon‐Like Nature of Zwitterionic Micelles: The Effect of Ionic Liquid Addition on the Properties of Aqueous Sulfobetaine Micelles

The Chameleon‐Like Nature of Zwitterionic Micelles: The Effect of Ionic Liquid Addition on the Properties of Aqueous Sulfobetaine Micelles

The characteristic ratio of poly(methacrylic acid) in organic solvents

Tacticity and Counterion Modulated Temperature Response of Weak Polyelectrolytes: The Case of Poly(methacrylic acid) Stereoisomers in Aqueous Solutions

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