Release of Hydrophobic Substances from Polystyrene-Methacrylic Acid Block Copolymer Micelles into Aqueous Media

1995 ◽  
Vol 2 (1) ◽  
pp. 31-41 ◽  
Author(s):  
Emin Arca ◽  
Minmin Tian ◽  
Stephen E. Webber ◽  
Petr Munk
Keyword(s):  
Block Copolymer ◽  
Methacrylic Acid ◽  
Aqueous Media ◽  
Hydrophobic Substances ◽  
Block Copolymer Micelles ◽  
Copolymer Micelles

Study of Sedimentation Velocity of Block Copolymer Micelles

1993 ◽  
Vol 58 (1) ◽  
pp. 71-76 ◽  
Author(s):  
Minmin Tian ◽  
C. Ramireddy ◽  
Stephen E. Webber ◽  
Petr Munk
Keyword(s):  
Block Copolymer ◽  
Methacrylic Acid ◽  
Mixed Solvent ◽  
Hard Spheres ◽  
Sedimentation Velocity ◽  
Hydrodynamic Coefficient ◽  
Block Copolymer Micelles ◽  
Copolymer Micelles ◽  
Size Heterogeneity ◽  
Good Agreement

No anomalies were observed during the measurement of sedimentation coefficients of block copolymer micelles formed by copolymers of styrene and methacrylic acid in a mixed solvent; 80 vol.% of dioxane and 20 vol.% of water. The shapes of the sedimenting boundaries suggest that the size heterogeneity of the micelles is small. Linear relations between 1/s and c were obtained. The value of the hydrodynamic coefficient κ was between 2 and 4 in a good agreement with the value 2.75 or 2.86 that was obtained by combining Burgers' or Fixman's values of the coefficient of the concentration dependence kvs for hard spheres with Einstein's value of [η] for spheres.

Fluorometric and Ultraviolet−Visible Absorption Study of Poly(methacrylic acid) Shells of High-Molar-Mass Block Copolymer Micelles†

Langmuir ◽  
1999 ◽  
Vol 15 (12) ◽  
pp. 4185-4193 ◽  
Author(s):  
Miroslav Štěpánek ◽  
Klára Podhájecká ◽  
Karel Procházka ◽  
Yue Teng ◽  
Stephen E. Webber
Keyword(s):  
Block Copolymer ◽  
Methacrylic Acid ◽  
Molar Mass ◽  
Absorption Study ◽  
Visible Absorption ◽  
High Molar Mass ◽  
Block Copolymer Micelles ◽  
Copolymer Micelles

Fluorometric Studies of the Polyelectrolyte Shell of Block Copolymer Micelles in Aqueous Media

Langmuir ◽  
1999 ◽  
Vol 15 (26) ◽  
pp. 8800-8806 ◽  
Author(s):  
Miroslav Štěpánek ◽  
Karel Procházka
Keyword(s):  
Block Copolymer ◽  
Aqueous Media ◽  
Block Copolymer Micelles ◽  
Copolymer Micelles

Block copolymer micelles in aqueous media

1992 ◽  
Vol 58 (1) ◽  
pp. 195-199 ◽  
Author(s):  
P. Munk ◽  
C. Ramireddy ◽  
M. Tian ◽  
S. E. Webber ◽  
K. Procházka ◽  
...  
Keyword(s):  
Block Copolymer ◽  
Aqueous Media ◽  
Block Copolymer Micelles ◽  
Copolymer Micelles

Block Copolymer Micelles in Aqueous Media

1993 ◽  
Vol 58 (10) ◽  
pp. 2362-2369 ◽  
Author(s):  
Zdeněk Tuzar ◽  
Pavel Kratochvíl ◽  
Karel Procházka ◽  
Petr Munk
Keyword(s):  
Methacrylic Acid ◽  
Dynamic Equilibrium ◽  
Aqueous Media ◽  
Sedimentation Velocity ◽  
Micellar System ◽  
Micellar Systems ◽  
Large Particles ◽  
Block Copolymer Micelles ◽  
Copolymer Micelles ◽  
Rich Mixtures

Micellization of di- and triblock copolymers, poly(methacrylic acid)-block-polystyrene and poly(methacrylic acid)-block-polystyrene-block-poly(methacrylic acid), varying in molecular weight and composition, has been studied by static and dynamic light scattering, and sedimentation velocity. Micelles with polystyrene cores were prepared in water-dioxane mixtures, rich in dioxane, and transferred into water-rich mixtures, water, and aqueous buffers via stepwise dialysis. It has been shown that, in dioxane-rich mixtures, the micellar system was in dynamic equilibrium, while in water-rich solvents, water, and aqueous buffers the micellization equilibrium was frozen and micelles behaved like autonomus particles. Under certain conditions, micelles were accompanied by independent large particles. This phenomenon, known from other micellar systems as an "anomalous micellization", is discussed.

Polystyrene-poly(methacrylic acid) block copolymer micelles

1994 ◽  
Vol 27 (1) ◽  
pp. 120-126 ◽  
Author(s):  
Anwei Qin ◽  
Minmin Tian ◽  
C. Ramireddy ◽  
Stephen E. Webber ◽  
Petr Munk ◽  
...  
Keyword(s):  
Block Copolymer ◽  
Methacrylic Acid ◽  
Block Copolymer Micelles ◽  
Copolymer Micelles

Characterization of block copolymer micelles in aqueous media

1993 ◽  
Vol 52 (0) ◽  
pp. 45-54 ◽  
Author(s):  
Petr Munk ◽  
Anwei Qin ◽  
Minmin Tian ◽  
C. Ramireddy ◽  
Stephen E. Webber ◽  
...  
Keyword(s):  
Block Copolymer ◽  
Aqueous Media ◽  
Block Copolymer Micelles ◽  
Copolymer Micelles
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