Fluorescence studies of the interaction of sodium dodecyl sulfate with hydrophobically modified poly(ethylene oxide)

Hu, Y. Z.; Zhao, Cheng Le; Winnik, Mitchell A.; Sundararajan, P. R.

doi:10.1021/la00094a030

Cited by 44 publications

(40 citation statements)

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“…The amount of dye was determined from the UV-visible spectral intensity assuming for the molar extinction coefficient the value of the free dye in the same solvent. [34][35][36][37] The electronic absorption and emission spectra of the dye-PMAA are illustrated in Figure 1. In the absorption measurements with dilute solution, no evidences of dimerization of the dye were observed in the spectra, indicating that the fluorescent probe is dispersed in the macromolecular media.…”

Section: Polymer Propertiesmentioning

confidence: 99%

“…1,2 Time resolved fluorescence spectroscopy (TRFS) was found to be particularly useful in the study of several types of polymers in solution, and in the presence of additives. [3][4][5][6][7][8][9][10] Time resolved anisotropy decay of a fluorescent probe attached to a polymer chain reflects the rotational relaxation of the probe, and the local dynamics of the polymer segments in solution. 2 The dependence of the segmental dynamics as a function solvent viscosity was studied by TRFS using anthracene attached to 1,2 polybutadiene.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Time resolved fluorescence anisotropy of basic dyes bound to poly(methacrylic acid) in solution

Oliveira¹,

Gehlen²

2003

J. Braz. Chem. Soc.

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Soluções de poli(ácido metacrílico) atático, PAMA com peso molecular na faixa de (1,6 a 3,4) x 10 5 g mol -1 , e com corantes fluorescentes 9-aminoacridina ou azul do nilo ligados à cadeia, foram estudados por medidas fotofísicas em função da viscosidade e polaridade do solvente. O comportamento dos segmentos da cadeia do PAMA nas vizinhanças da sonda fluorescente foi descrito pela mudança na rotação difusional dos corantes. O etilenoglicol expande a cadeia polimérica quando comparada com a forma mais compactada do corante-PAMA em 50% água/etilenoglicol. A variação do tempo de relaxação rotacional do corante ligado ao PAMA indica uma expansão progressiva da cadeia polimérica para uma forma aberta em etilenoglicol.Solutions of atactic poly(methacrylic acid), PMAA, with molecular weights in the range of (1.6 to 3.4) x 10 5 g mol -1 , and labeled with the fluorescent dyes 9-aminoacridine or Nile blue were studied by photophysical measurements as a function of solvent viscosity and polarity. The conformational behavior of the PMAA chain segments around the fluorescent probe was reported by the change in the rotational diffusion of the dyes. Ethylene glycol swells the polymer chain compared with the more contracted conformation of PMAA in 50% water/ethylene glycol. The change in the rotational relaxation time of the dye bound to PMAA with the decrease of water content in the solvent mixture indicates a progressive expansion of polymer chain to a more open coil form in solution.Keywords: dyes, polyelectrolytes, PMAA, rotational diffusion, solvent friction IntroductionPhotophysical studies of polymers in solution have been extensively reported in recent years. 1,2 Time resolved fluorescence spectroscopy (TRFS) was found to be particularly useful in the study of several types of polymers in solution, and in the presence of additives. 3-10 Time resolved anisotropy decay of a fluorescent probe attached to a polymer chain reflects the rotational relaxation of the probe, and the local dynamics of the polymer segments in solution. 2 The dependence of the segmental dynamics as a function solvent viscosity was studied by TRFS using anthracene attached to 1,2 polybutadiene. 11,12 The polymer local dynamics as well as the structural properties and relaxation processes of polymer and blends were studied by steady state and dynamic fluorescence using anthranyl and pyrenyl groups. [13][14][15] Fluorescence studies of polymethacrylic acid (PMAA) and polyacrylic acid (PAA) containing aromatic fluorescent probes such as naphthalene, anthracene and pyrene have been carried out by many authors to elucidate the properties of those polyelectrolytes in different solvents, pH, and surfactant addition. [16][17][18][19][20] Fluorescence anisotropy reflects the microviscosity and the solubilization dynamics of the probe molecule in solutions of polyelectrolytes. Reports in the literature using polarization and anisotropy of rhodamine 6 G in ethylene glycol demonstrate that the depolarization properties of the probe have relations with the solv...

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Section: Polymer Propertiesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Time resolved fluorescence anisotropy of basic dyes bound to poly(methacrylic acid) in solution

Oliveira¹,

Gehlen²

2003

J. Braz. Chem. Soc.

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“…In the second case, the fluorophore is covalently bound to the polymer chain. Winnik et al studied the interactions of pyrene-labeled hydroxypropylcellulose (PyHPC) [52] and PEO (PyPEO) [53] with SDS. Both excimer/monomer emission intensity ratio (I E /I M ) and I 3 /I 1 indicate that these polymers associate with surfactants and form polymer-surfactant complexes below the critical micelle concentration (CMC).…”

Section: Introductionmentioning

confidence: 99%

Interactions of micelles with fluorescence-labeled polyelectrolytes

Morishima

Mizusaki

Yoshida

et al. 1999

Colloids and Surfaces A: Physicochemical and Engineering Aspect

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Pyrene-labeled polyelectrolytes can be used to study the interaction between the polyelectrolyte and an oppositely charged micelle, if the micelle incorporates a fluorescence quencher. If the charge on the micelle is varied systematically, polymer-micelle complex formation can be observed at some well-defined micelle surface charge density. Applying a kinetic model to steady-state and time-dependent fluorescence quenching data, one can estimate the binding constant (K), association rate constant, and lifetime (residence time). K increases strongly with increase in micelle surface charge density (|) or decrease in ionic strength (v). These effects arise from the dependence of association rate constant and residence time on | and v. While these observations reflect the fundamental electrostatic nature of the interaction, it is also found that micelles preferentially bind to pyrene sites, so that complex formation results from the conjoint action of electrostatic and hydrophobic forces.

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“…However, in making use of fluorescence-labeled polyelectrolytes, it is important to consider perturbation by the label. In fact, the labeled neutral polymer PyPEO 45 behaves as a hydrophobically modified polymer even if the mole fraction of pyrene is small (=1 mol %), and the pyrene label enhances the hydrophobic association with micelles. Other studies [47][48][49][50] have also shown that hydrophobic modifications strengthen the polymer-surfactant interaction by providing hydrophobic sites to which surfactants bind preferentially.…”

Section: Introductionmentioning

confidence: 99%

Binding of Cationic Mixed Micelles to Pyrene-Labeled Poly((acrylamido)-2-methylpropanesulfonate)

et al. 1997

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The interaction between pyrene-labeled poly(acrylamido)-2-methylpropane sulfonate) (PyPAMPS) and mixed micelles of n-dodecylhexaoxyethylene glycol monoether/n-hexadecyltrimethylammonium chloride (C12E6/CTAC) was studied by turbidimetry, quasielastic light scattering (QELS), fluorescence quenching, and UV spectroscopy. The present report focuses on the effect of the pyrene label on the polymer-micelle interaction. With nonlabeled PAMPS, we observe by turbidity and QELS a critical mole fraction of ionic surfactant (Yc) corresponding to the onset of polyelectrolyte-micelle interaction. The same Yc is observed by turbidity and QELS for PyPAMPS. However, PyPAMPS shows a lower additional transition by the same methods, which we refer to as "Yc1" to distinguish it from "Yc2" which is seen for both PAMPS and PyPAMPS. Steady-state fluorescence, in the presence of a hydrophobic quencher (N,N-dimethylaniline) solubilized in the micelles, also shows a discontinuity at Yc1. Therefore, we conclude that Yc1 and Yc2 correspond to the binding of micelles to polymeric pyrene sites and AMPS sites, respectively. Analysis of UV spectra at varying Y demonstrates that the polymer-bound pyrene penetrates inside micelles and resides at or near the hydrophobic core. These results indicate preferential binding of micelles to pyrene binding sites; nevertheless, both Yc1 and Yc2 show a linear dependence on the square root of the ionic strength. This dependence suggests the dominant role of electrostatic forces, consistent with the observation that nonionic micelles will not bind to PyPAMPS. We conclude that conjoint hydrophobic and electrostatic effects determine the interaction between PyPAMPS and C12E6/ CTAC mixed micelles.

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Fluorescence studies of the interaction of sodium dodecyl sulfate with hydrophobically modified poly(ethylene oxide)

Cited by 44 publications

References 0 publications

Time resolved fluorescence anisotropy of basic dyes bound to poly(methacrylic acid) in solution

Time resolved fluorescence anisotropy of basic dyes bound to poly(methacrylic acid) in solution

Interactions of micelles with fluorescence-labeled polyelectrolytes

Binding of Cationic Mixed Micelles to Pyrene-Labeled Poly((acrylamido)-2-methylpropanesulfonate)

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