Phase separation of aqueous solutions of cellulose derivatives: influence of surfactants

Goldszal, Alexandre; Costeux, Stéphane; Djabourov, Madeleine

doi:10.1016/0927-7757(95)03425-0

Cited by 21 publications

(15 citation statements)

References 13 publications

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“…HMHEC solutions have been investigated from several points of view, including their interaction with surfactants. , Using a hydrophobic nitroxide spin probe, Tanaka et al17d inferred an onset of association of about 0.2 wt % for an HMHEC similar to that which we investigate here. Dualeh and Steiner used fluorescence quenching experiments to characterize the mixed aggregates formed by HMHEC in the presence of a large excess of sodium dodecyl sulfate (SDS) surfactant 19b.…”

Section: Introductionsupporting

confidence: 62%

Fluorescence Studies of Hydrophobically Modified Hydroxyethylcellulose (HMHEC) and Pyrene-Labeled HMHEC

et al. 1998

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We report pyrene fluorescence probe experiments which examine the association in aqueous solution of a hydrophobically modified hydroxyethylcellulose (HMHEC) of M w ≈ 300 000 containing on average 1 C16H33 group/143 anhydroglucose units as well as the transformation of this polymer into a pyrene-labeled derivative HMHEC-Py-1 containing 1 pyrene/200 glucose units. Fluorescence studies of mixtures of HMHEC-Py-1 + HMHEC in water demonstrate that both pyrene−pyrene and pyrene−C16 associations occur, and we are able to infer that even in the most dilute solutions that we can examine these polymers exist as small aggregates of several polymer molecules. HMHEC-Py-1 exhibits excimer emission at concentrations as low as 0.01 g/L. As the polymer concentration is increased, one observes a sharp increase in the reduced viscosity at 1.5−2.0 g/L. Over the same range of concentrations HMHEC-Py-1 exhibits an increase in I E/I M values, indicating that the viscosity increase is due to a substantial increase in polymer association. HMHEC solubilizes pyrene as a fluorescent probe. The limiting solubility, approximately 1 pyrene/35 C16 alkyl groups, and the partition coefficient (5 × 104) are much smaller than those found for other more flexible associating polymers, yet the I 1/I 3 value is consistent with solubilization of pyrene in domains large enough to minimize exposure of the probe to water. We infer that HMHEC in water forms hydrophobic domains with a large size polydispersity. The mean aggregate size is small, but hydrophobic probes such as pyrene and bis(1-pyrenylmethyl) ether are solubilized preferentially in the largest hydrophobic domains.

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Section: Introductionsupporting

confidence: 62%

Fluorescence Studies of Hydrophobically Modified Hydroxyethylcellulose (HMHEC) and Pyrene-Labeled HMHEC

et al. 1998

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“…The interaction between surfactants and temperature responding polymers has been studied for several systems. [41][42][43][53][54][55] The reported mechanisms are rather complex.…”

Section: The Influence Of Surfactants On the Size Of Mesoglobulesmentioning

confidence: 99%

Mesoglobules of random copolyethers as templates for nanoparticles

Trzebicka

Weda

Utrata-Wesołek

et al. 2010

J. Polym. Sci. A Polym. Chem.

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An approach to nanoparticles based upon the thermosensitivity of a copolyether is described. Two thermosensitive copolymers of glycidol with molar masses of 800,000 g/ mol randomly substituted with ethyl isocyanate (28 and 35% substitution) were used to obtain mesoglobules. The effects of copolymer concentration and of the presence of surfactants (sodium dodecyl sulfate and hexadecyltrimethylammonium bromide) on the size of the mesoglobules formed were investigated. The obtained mesoglobules were monomodal and of narrowly distributed diameters, as shown by dynamic light scattering and atomic force microscopy measurements. The radical nucleated copolymerization of N-isopropylacrylamide with N,N 0 -methylenebisacrylamide as a crosslinker was performed in the presence of the mesoglobules. Nanoparticles of monomodal size distribution and low dispersity were obtained.

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“…[27][28][29] A few studies involving tetra-and hexadecyltrimethylammonium chloride and bromide (TTAC, TTAB, HTAC and HTAB) surfactants and cellulose ethers such as MC, carboxymethyl cellulose (CMC), hydroxypropyl cellulose (HPC) and ethylhydroxyethyl cellulose (EHEC) have been reported. 17,[30][31][32][33] Investigations describing the influence of surfactants on the solution properties of MC in detail are conspicuously limited. 22,34 Li et al 34 studied the effect of varied concentrations of HTAB on the gelation temperature of MC using micro-differential scanning calorimetry (DSC) and rheometry.…”

Section: Introductionmentioning

confidence: 99%

Rheological and Fluorescence Investigation of Interaction between Hexadecyltrimethylammonium Bromide and Methylcellulose in the Presence of Hydrophobic Salts

et al. 2010

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The interaction of hexadecyltrimethylammonium bromide (HTAB) and methylcellulose (MC) has been investigated in aqueous medium employing rheological and fluorescence probing experiments. The associated physicochemical properties of the polymer-surfactant mixed system such as critical aggregation concentration (cac), critical micelle concentration (cmc), micellar aggregation number (N), micellar micropolarity index (pyrene I(1)/I(3) values), and viscosity curve are studied as a function of HTAB concentration. The effects of sodium benzoate (NaBz), sodium hexanoate (NaHx) and sodium chloride (NaCl) on the behavior of the polymer-surfactant solution have been followed systematically. The obtained experimental findings unfold significant information with respect to the effects of the salts on the solution behavior of the mixed system in addition to gelation characteristics.

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Phase separation of aqueous solutions of cellulose derivatives: influence of surfactants

Cited by 21 publications

References 13 publications

Fluorescence Studies of Hydrophobically Modified Hydroxyethylcellulose (HMHEC) and Pyrene-Labeled HMHEC

Fluorescence Studies of Hydrophobically Modified Hydroxyethylcellulose (HMHEC) and Pyrene-Labeled HMHEC

Mesoglobules of random copolyethers as templates for nanoparticles

Rheological and Fluorescence Investigation of Interaction between Hexadecyltrimethylammonium Bromide and Methylcellulose in the Presence of Hydrophobic Salts

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