Fluorimetric and quasi-elastic light scattering study of the solubilization of nonpolar low-molar-mass compounds into water-soluble block-copolymer micelles

Kiserow, Douglas J.; Procházka, Karel; Ramireddy, C.; Tuzar, Zdeněk; Munk, Petr; Webber, S. E.

doi:10.1021/ma00027a072

Cited by 119 publications

(134 citation statements)

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“…Poly(sodium methacrylate) (PNaMA), a water-soluble polyelectrolyte, has been used for many objectives, such as surface modification of the wettability and friction [1], suppression of cell adhesion and protein adsorption [1,2], and self-assembly studies on amphiphilic block copolymers in aqueous media [3][4][5][6][7]. While PNaMA and its copolymers were prepared through the living anionic or living radical polymerizations of methacrylates with protecting groups of tert-butyl and benzyl, followed by deprotection [3][4][5][6][7], those were also directly obtained by the controlled/living radical polymerization of sodium methacrylate (NaMA) in water.…”

Section: Introductionmentioning

confidence: 99%

“…While PNaMA and its copolymers were prepared through the living anionic or living radical polymerizations of methacrylates with protecting groups of tert-butyl and benzyl, followed by deprotection [3][4][5][6][7], those were also directly obtained by the controlled/living radical polymerization of sodium methacrylate (NaMA) in water. For instance, the atom transfer radical polymerization (ATRP) of NaMA produced PNaMA with a well-controlled molecular weight [8].…”

Section: Introductionmentioning

confidence: 99%

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Aqueous Photo-Living Radical Polymerization of Sodium Methacrylate Using a Water-Soluble Nitroxide Mediator

Yoshida

2012

ISRN Polymer Science

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The aqueous photo-living radical polymerization of sodium methacrylate (NaMA) was attained using 2,2 -azobis{2-methyl-N-[1,1-bis(hydroxymethyl)-2-hydroxyethyl]-propionamide} (V-80) as the initiator and 4-hydroxy-2,2,6,6-tetramethylpiperidine-1-oxyl (HTEMPO) as the mediator in the presence of (4-fluorophenyl)diphenylsulfonium triflate (FS). The polymerization was carried out in water at room temperature by irradiation using a high-pressure mercury lamp. Whereas the polymerization by V-80 and/or FS in the absence of HTEMPO produced polymers with very high molecular weights and broad molecular weight distributions, the HTEMPO-mediated polymerization provided still lower-molecular-weight distributions using both V-80 and FS. The first-order time-conversion plots had an induction period up to 2.5 h; however, they thereafter showed a linear increase. The conversion-molecular weight plots also exhibited a linear correlation. A linear correlation was also obtained for the plots of the molecular weights versus the reciprocal of the initiator concentration. Based on these three correlations, it was found that the HTEMPO-mediated photopolymerization proceeded by a living mechanism.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Aqueous Photo-Living Radical Polymerization of Sodium Methacrylate Using a Water-Soluble Nitroxide Mediator

Yoshida

2012

ISRN Polymer Science

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“…[21] In aqueous solutions, the unimer concentration is negligible, micellar cores are collapsed, segmental motion (as well as the exchange of chains between micelles) is kinetically frozen and the core-forming blocks are in a non-equilibrium state. [21,22] Properties of aqueous solutions of block polyelectrolyte micelles are controlled mainly by the polyelectrolyte behavior of micellar shells. [23,24] Small hydrophobic molecules, such as benzene, anthracene, etc., that are only slightly soluble in water, may be efficiently solubilized in micellar cores in considerable quantities comparable with the mass of the core.…”

Section: Introductionmentioning

confidence: 99%

“…Micellar cores swell, and segmental motion may be liberated depending on the amount of the solubilizate, however the exchange of unimers between micelles is never achieved. [22,26,27] Interesting polymeric multi-layer nanoparticles, so called "onion-skin micelles" have been recently prepared during alkalimetric titration of acid mixtures of (i) micelles containing a hydrophobic core and a polyelectrolyte shell formed by poly (2-vinylpyridine), and (ii) a linear poly(2-vinylpyridine)-block-poly(ethyleneoxide) sample. [28] Poly(2-vinylpyridine), PVP, is protonized and water-soluble in acid solutions bellow pH 4.8.…”

Section: Introductionmentioning

confidence: 99%

Monte Carlo study of chain conformations in the swollen middle layer of onion-skin polymeric micelles

Jelı́nek¹,

Limpouchová²,

Procházka³

2000

Macromol. Theory Simul.

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“…Significant progress has been made M~l * M,,-l + U kt, in the theoretical (5)(6)(7)(8)(9)(10)(11)(12) and experimental (13)(14)(15)(16)(17)(18)(19) understanding of the equilibrium properties, such as the size and where k,, and k-, are the rate constants for chain incorporaaggregation number, of micelles. The study of micelle chain tion into and dissociation from a micelle, respectively.…”

Section: Introductionmentioning

confidence: 99%

Chain exchange kinetics of diblock copolymer micelles studied by nonradiative energy transfer. 1. Experimental design and theory

Liu¹

1995

Can. J. Chem.

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A fluorescence experiment involving mixing donor-labeled micelles with acceptor-labeled unimers has been designed and a kinetic scheme for describing such an experiment has been proposed. An approximate analytical solution was found for the decrease in the donor fluorescence intensity at time t after sample mixing relative to that at time zero, I(t) [I(O). Treating the data of this decrease in donor fluorescence intensity as a function of time using the derived equation allows the simultaneous determination of the rate constant k,, for unimer incorporation into micelles and the quenching efficiency cp of donor fluorescence by an acceptor in a micelle.Key words: polymer micelles, dynamics, chain exchange, energy transfer.RCsumC : On a mis au point une expCrience de fluorescence impliquant le melange des micelles contenant un donneur marquC avec des unimkres accepteurs marquCs et on propose un schCma cinCtique pour dCcrire une telle expkrience. On a trouvC une solution analytique approximative pour expliquer la diminution de llintensitC de la fluorescence du donneur A un temps t. relatif au temps zCro, l(t)/1(0), du mClange de I'Cchantillon. Le traitement des donnCes relatives A la diminution de 1'intensitC de la fluorescence du donneur en fonction du temps en faisant appel ? i 1'Cquation dCrivCe permet de dtterminer simultanCment la constante de vitesse, k,,, pour l'incorporation de l'unimkre dans les micelles et pour I1efficacitC d'extinction, cp, de la fluorescence d'un donneur par un accepteur dans une micelle.Mots clis : micelles de polymkre, dynamique, Cchange de chaine, transfert d'Cnergie.[Traduit par la rCdaction]

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Fluorimetric and quasi-elastic light scattering study of the solubilization of nonpolar low-molar-mass compounds into water-soluble block-copolymer micelles

Cited by 119 publications

References 2 publications

Aqueous Photo-Living Radical Polymerization of Sodium Methacrylate Using a Water-Soluble Nitroxide Mediator

Aqueous Photo-Living Radical Polymerization of Sodium Methacrylate Using a Water-Soluble Nitroxide Mediator

Monte Carlo study of chain conformations in the swollen middle layer of onion-skin polymeric micelles

Chain exchange kinetics of diblock copolymer micelles studied by nonradiative energy transfer. 1. Experimental design and theory

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