Kinetics of Micelle Formation with Change of Micelle Shape in a Dilute Solution of Diblock Copolymers

1998 ◽  
Vol 31 (21) ◽  
pp. 7356-7364 ◽  
Author(s):  
Kayori Iyama ◽  
Takuhei Nose
Keyword(s):  
Diblock Copolymers ◽  
Micelle Formation ◽  
Dilute Solution ◽  
Kinetics Of

Adsorption Kinetics of Diblock Copolymers from a Micellar Solution on Silica and Titania

1998 ◽  
Vol 31 (26) ◽  
pp. 9281-9294 ◽  
Author(s):  
H. D. Bijsterbosch ◽  
M. A. Cohen Stuart ◽  
G. J. Fleer
Keyword(s):  
Adsorption Kinetics ◽  
Micellar Solution ◽  
Diblock Copolymers ◽  
Kinetics Of ◽  
Silica And Titania

scholarly journals Phase Equilibrium and Interdiffusion in Poly(Vinyl Methyl Ether)-Water System

Polymers ◽  
2020 ◽  
Vol 12 (11) ◽  
pp. 2445 ◽  
Author(s):  
Uliana V. Nikulova ◽  
Anatoly E. Chalykh
Keyword(s):  
Phase Equilibrium ◽  
Methyl Ether ◽  
Diffusion Coefficients ◽  
Water System ◽  
State Diagram ◽  
Pair Interaction ◽  
Dilute Solution ◽  
Vinyl Methyl ◽  
Vinyl Methyl Ether ◽  
Kinetics Of

The phase state diagram of the poly(vinyl methyl ether)-water system in a wide concentration range was obtained by the optical interferometry method. It was shown that this system was characterized by a complicated phase equilibrium with two lower critical solution temperatures, one of which was located in the concentrated region at 21 °C, and the other one in the region of a dilute solution at 31 °C. In the framework of the Flory–Huggins theory, pair interaction parameters were calculated for different parts of the binodal curves, and an attempt was made to reverse simulate the diagram in different conditions. It was suggested that the unusual character of the diagram was associated with the formation of a complicated complex between PVME and water in the middle region of the compositions. Concentration profiles for different temperatures were constructed. For the first time for this system, the numerical values of the diffusion coefficients of poly(vinyl methyl ether) (PVME) into water and water in PVME were obtained. Concentration and temperature dependences of diffusion coefficients were constructed and analyzed. The kinetics of water sorption in PVME was plotted, the clustering integral was calculated, and the approximate number of molecules in a water cluster was estimated. It was shown that in the dilute solution region upon passing through the binodal curve, the interphase disappeared immediately, and the remaining fluctuation of the concentration decreased in size with time. The kinetics of this process was estimated from the change in the size of such a particle.

Interfacial Segregation Effects in Mixtures of Homopolymers with Copolymers.

1989 ◽  
Vol 171 ◽  
Author(s):  
Vijay S. Wakharkar ◽  
Thomas P. Russell ◽  
Vaughn R. Deline
Keyword(s):  
Mass Spectroscopy ◽  
Diblock Copolymers ◽  
Large Range ◽  
Surface Enrichment ◽  
Molecular Weights ◽  
Polymer Interface ◽  
Segregation Process ◽  
Interfacial Segregation ◽  
Kinetics Of ◽  
Secondary Ion

ABSTRACTSecondary Ion Mass Spectroscopy (SIMS) has been used to study the surface and interfacial segregation of diblock copolymers in mixtures of the copolymer in the homopolymer. Symmetric, diblock copolymers of polystyrene (PS) and poly(methyl methacrylate) (PMMA), in either the PS or the PMMA homopolymers were investigated. In mixtures of the copolymer with the PS homopolymer, systematic surface enrichment of the copolymer as well as segregation of the copolymer to the polymer/Si interface or in the case of bilayered filmsto the polymer/polymer interface occurs with annealing treatments. These segregation effects persist over a large range of homopolymer molecular weights with changes in the kinetics of the segregation process being predominant.

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