Critical micellization phenomena in block polyelectrolyte solutions

Astafieva, Irina; Zhong, Xing; Eisenberg, Adi

doi:10.1021/ma00078a034

Cited by 578 publications

(582 citation statements)

References 30 publications

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“…In figure 7 are shown the results obtained by plotting Wilhelm's equation for C4 block copolymer. The CMC values obtained with this method are in the range 10 -6 -10 -7 M (see table 4), and they are similar to those reported for block copolymers based on polystyrene PS 5,6,37,38 .…”

Section: Self-assembly Of Diblock Copolymers In Aqueous Solutionsupporting

confidence: 82%

“…Pyrene has been widely used in the study of microheterogeneous systems because its fluorescence and excitation spectra changes with the polarity of the environment where it is located 36 . Based on the changes of emission and excitation spectra of pyrene with polymer concentration several methods to determine the critical micelle concentration CMC of block copolymers have been proposed 37,38 . The most accepted method has been proposed by Wilhelm et al and uses the effect of polymer concentration on the excitation spectra of pyrene 38 .…”

Section: Self-assembly Of Diblock Copolymers In Aqueous Solutionmentioning

confidence: 99%

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Synthesis, Thermal Behavior, and Aggregation in Aqueous Solution of Poly(methyl Methacrylate)-B-Poly(2-Hydroxyethyl Methacrylate)

Acevedo¹,

Martínez

Olea³

2013

J. Chil. Chem. Soc.

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Amphiphilic block copolymers of poly(methyl methacrylate) PMMA and poly(2-hidroxyethyl methacrylate) PHEMA were synthesized by a two-step atom transfer radical polymerization (ATRP). Copolymers with various degrees of polymerization and different relative block sizes were obtained. The structure of the resulting polymers have been characterized and verified by FT-IR and 1 H-NMR, molecular weight were determined by size exclusion chromatography analyses. The thermal properties of these polymers were investigated by differential scanning calorimetry DSC and thermogravimetric analysis TGA. The glass transition temperature of mono halogenated PMMA increases from 116 ºC to 123 ºC with increasing molecular weight, whereas the glass transition temperature of block copolymers depends slightly on polymer structure. The derivatives of TGA curves indicate that thermal degradation occurs in one stage. The self-assembly of PMMA-b-PHEMA in aqueous solution have been investigated by fluorescence probing methods. The critical micelle concentrations are in the range 10 -6 -10 -7 M. The micropolarity sensed by pyrene is higher than in aggregates formed by block copolymers based on polystyrene.

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Section: Self-assembly Of Diblock Copolymers In Aqueous Solutionsupporting

confidence: 82%

Section: Self-assembly Of Diblock Copolymers In Aqueous Solutionmentioning

confidence: 99%

Synthesis, Thermal Behavior, and Aggregation in Aqueous Solution of Poly(methyl Methacrylate)-B-Poly(2-Hydroxyethyl Methacrylate)

Acevedo¹,

Martínez

Olea³

2013

J. Chil. Chem. Soc.

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“…[1][2][3][4][5][6][7][8] A wide range of micelle morphologies of block copolymers in solutions have been recently reported, and these morphologies possess better stability than those formed by small-molecule amphiphiles such as surfactants. [9][10][11][12][13][14][15] These block copolymer micelles can be potentially used in specific biological and medical applications. [16][17][18] To obtain different micelle morphologies of block copolymers in solutions, two sets of parameters need to be taken into account.…”

Section: Introductionmentioning

confidence: 99%

Self‐assembled, wormlike‐cylinder network of polystyrene‐block‐poly(ethylene oxide) micelles in solution

Bhargava¹,

Zheng²,

Quirk³

et al. 2006

J Polym Sci B Polym Phys

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ABSTRACT:We report the formation of a highly entangled and interconnected, selfassembled, wormlike-cylinder network of polystyrene-block-poly(ethylene oxide) in N, N-dimethylformamide/water. In this system, N,N-dimethylformamide was a common solvent and water was a selective solvent for the poly(ethylene oxide) blocks. The degrees of polymerization of the polystyrene and poly(ethylene oxide) blocks were 962 and 227, respectively. The network was formed at copolymer concentrations higher than 0.4 wt % and consisted of self-assembled, wormlike cylinders that were interconnected by Y-shaped, T-shaped, and multiple junctions. The network morphology was visualized with transmission electron microscopy. Capillary viscometry measurements revealed an order-of-magnitude increase in the inherent viscosity of the colloidal system upon the formation of the network. A similar effort to obtain a wormlike-cylinder network in an N,N-dimethylformamide/acetonitrile system, in which acetonitrile was a selective solvent for the poly(ethylene oxide) blocks, was unsuccessful even at high copolymer concentrations; instead, the wormlike cylinders showed a tendency to align. The viscosity measurements also did not show a substantial increase in the inherent viscosity. Thus, the solvent played a critical role in determining the formation of the self-assembled, wormlike-cylinder network. This formation of the network resulted from an interplay between the end-capping energy, bending energy (curvature), and configurational entropy of the self-assembled, wormlike-cylinder micelles that minimized the free energy.

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“…The spectral bands centered at 335 and 338 nm are assignable to pyrene molecules in the bulk water phase and the hydrophobic phase, respectively. 33,34 Thus, excitation spectra shown in Figure 3 indicate that pyrene probes are partitioned between hydrophobic microdomains formed by the surfmer units in P-ATMAC/DEmMA(x) and the bulk water phase. We estimated the ratio of the intensity at 338 nm to that at 335 nm (I 338 /I 335 ) and plotted as a function of the polymer concentration in Figure 4.…”

Section: Critical Micelle Concentration Of Copolymersmentioning

confidence: 99%

Synthesis and association behavior of cationic amphiphilic copolymers consisting of quaternary ammonium and nonionic surfactant moieties

Morikawa

Morishima

Motokucho

et al. 2007

J. Polym. Sci. A Polym. Chem.

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Critical micellization phenomena in block polyelectrolyte solutions

Cited by 578 publications

References 30 publications

Synthesis, Thermal Behavior, and Aggregation in Aqueous Solution of Poly(methyl Methacrylate)-B-Poly(2-Hydroxyethyl Methacrylate)

Synthesis, Thermal Behavior, and Aggregation in Aqueous Solution of Poly(methyl Methacrylate)-B-Poly(2-Hydroxyethyl Methacrylate)

Self‐assembled, wormlike‐cylinder network of polystyrene‐block‐poly(ethylene oxide) micelles in solution

Synthesis and association behavior of cationic amphiphilic copolymers consisting of quaternary ammonium and nonionic surfactant moieties

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