Polyelectrolyte hydrophobically modified

Perrin P, Monfreux N, Lafuma F. Highly hydrophobically modified polyelectrolytes stabilizing macroemulsions relationship between copolymer structure and emulsion type. Colloid Polym Sci 1999 277 89-94. 

FIG. 2 Turbidity difference between solutions containing 20 ppm PCMA and different amounts of SDS, and the corresponding polyelectrolyte-free SDS solutions. Data are shown for PCMA with a mean molecular weight of 1.6 X 106 g/mol ( ) and 9 X 105 g/mol ( ), and for the hydrophobically modified polyelectrolyte 40 DT with a molecular weight of approximately 3.2 X 104 g/mol ( ). 

Guillemet F., Piculell L. Interactions in aqueous mixtures of hydrophobically modified polyelectrolyte and oppositely charged surfactant. Mixed micelle formation and associative phase separation. J. Phys. Chem. 1995 99 9201-9209. 

Mizusaki M, Morishima Y, Dubin PL. Interaction of pyrene-labeled hydrophobically modified polyelectrolytes with oppositely charged mixed micelles studied by fluorescence quenching. J Phys Chem 1998 102 1908-1915. 

Magny B, Iliopoulos I, Audebert R. Aggregation of hydrophobically modified polyelectrolytes in dilute solutions ionic strength effects. In Dubin P, Bock J, Davies RM, Schulz DN, Thies C, eds. Macromolecular Complexes in Chemistry and Biology. Berlin Springer Verlag, 1994 51-62. 

Modification of poly(2-vinylpyridine) with a long-chain K-dodecyl bromide was the first published example of a polysoap in the literature [192]. (The term polysoap arises from the fact that the resulting modified polyelectrolyte displays similar properties to that of an ordinary soap [192,193].) Dependent on the aqueous solution conditions and the nature of the hydrophobe, modified polyelectrolytes can associate either intramolecularly or intermolecularly [194], and this has created interest from a technological perspective potential applications include use as associative thickeners and rheology modifiers [195]. 

Energy-transfer measurements have also provided an insight into the structure of amphiphilic block copolymer micelles with hydrophobically modified polyelectrolyte shells [172]. 

Photophysical studies on a conformational transition of PMA induced by cationic surfactants have been reported (7). The stretched PMA chain at pH 8 collapses on addition of cationic surfactants that is, the hydrophobic interactions between the cationic surfactants that are bonded to the PMA chain lead to refolding of the polymer chain, and thus provide a hydrophobic site for fluorescence probes at pH 8. The cationic polyelectrolyte poly(4-vinylpyridine) quatemized with n-dodecyl bromide (8 i0) or hexadecyl bromide (11) are also examples of hydrophobically modified polyelectrolytes. 

Lee CT Jr., Smith KA, Hatton TA. 2004. Photoreversible viscosity changes and gelation in mixtures of hydrophobically modified polyelectrolytes and photosensitive surfactants. Macromolecules 37 5397 5405. 

Lowe, T. L., Virtanen, J. and Tenhu, H., Interactions of drugs and spin probes with hydrophobically modified polyelectrolyte hydrogels based on N-isopropylacrylamide. Polymer, 40, 2595-2603 (1999). 

Figure 20.11. Addition of a surfactant to a solution of a hydrophobically modified polyelectrolyte (in this case hydrophobically modified polyacrylate) gives very different viscosity effects for different types of surfactants. The effect is much larger for an oppositely charged surfactant, dodecyltrimethylammonium bromide (DTAB), than it is for a nonionic (C12E5) or a similarly charged one, sodium dodecyl sulfate (SDS). (Redrawn from B. Magny, I. Iliopoulos, R. Audebert, L. Piculell and B. Lindman, Progr. Colloid. Polym. ScL, 89 (1992) 118)...

Sarrazin-Cartalas A, Iliopoulus I, Audebert R, Olsson U. Association and thermal gelation in mixtures of hydrophobically modified polyelectrolytes and nonionic surfactants. Langmuir 1994 10 1421-1426. 

Costa T, Miguel MG, Lindman B et al (2005) Dynamics and energetics of the self-assembly of a hydrophobically modified polyelectrolyte naphthalene-labeled poly(acrylic acid). J Phys Chem B 109 11478-11492... 

Magny, B., I. Iliopoulos, R. Zana, and R. Audebert (1994). Mixed micelles formed by cationic surfactants and anionic hydrophobically modified polyelectrolytes. Langmuir 10(9) 3180-3187. 

Single-Molecular Assemblies of Hydrophobically-Modified Polyelectrolytes and Their Functionalization... 

The association of polymer-bound hydrophobes can occur either within a single polymer chain or between different polymer chains, or both at a time, depending on the type of amphiphilic polymer. In Ughly dilute aqueous solutions, in general, hydrophobic associations may occur witiiin a polymer chain, but with an increase in the polymer concentration, a tendency for inteipolymer association may increase. In the case of hydrophobically-modified nonionic polymers, tiie association of polymer-bound hydrophobes can occur even if the hydrophobe content in a polymer is very low (4-6). In the case of hydrophobically-modified polyelectrolytes, however, a relatively Ugh content of hydrophobes is necessaiy for the association to occur, because... 

Prochazka K, Matejicek P, Uchman M, Stepanek M, Humpolickova J, Hof M, Sptrkova M (2008) pH-dependent behavior of hydrophobically modified polyelectrolyte shells of polymeric nanoparticles. Macromol Symp 273 95-102... 

Guenoun P, Davis HT, Tirrell M, Mays JW (1996) Aqueous micellar solutions of hydrophobically modified polyelectrolytes. Macromolecules 29 3965-3969... 

MatejicekP, Humpolickova J, Prochazka K, Tuzar Z, SpirkovaM, Hof M, Webber SE (2003) Hybrid block copolymer micelles with partly hydrophobically modified polyelectrolyte shells in polar and aqueous media experimental study using fluorescence correlation spectroscopy, time-resolved fluorescence, light scattering, and atomic force microscopy. J Phys Chem B 107(32) 8232-8240. doi 10.1021/jp022221s... 

Aggregation of Hydrophobically Modified Polyelectrolytes in Dilute Solution ... 

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