Influence of Hydrophobic Cosolutes on the Associative/Segregative Phase Separation of Aqueous Cationic Surfactant−Polymer Systems

Langmuir ◽  
2002 ◽  
Vol 18 (17) ◽  
pp. 6504-6506 ◽  
Author(s):  
S. Nilsson ◽  
A. M. Blokhus ◽  
S. Hellebust ◽  
W. R. Glomm
Keyword(s):  
Phase Separation ◽  
Cationic Surfactant ◽  
Polymer Systems ◽  
Segregative Phase Separation

A Time-Resolved Low-Angle Light Scattering Apparatus. Application to Phase Separation Problems in Polymer Systems

2001 ◽  
Vol 66 (6) ◽  
pp. 973-982 ◽  
Author(s):  
Čestmír Koňák ◽  
Jaroslav Holoubek ◽  
Petr Štěpánek
Keyword(s):  
Phase Separation ◽  
Light Scattering ◽  
Signal To Noise Ratio ◽  
Scattered Light ◽  
Ccd Camera ◽  
Time Resolved ◽  
Polymer Systems ◽  
Software Analysis ◽  
Phase Separation Kinetics ◽  
Small Angle Light Scattering

A time-resolved small-angle light scattering apparatus equipped with azimuthal integration by means of a conical lens or software analysis of scattering patterns detected with a CCD camera was developed. Averaging allows a significant reduction of the signal-to-noise ratio of scattered light and makes this technique suitable for investigation of phase separation kinetics. Examples of applications to time evolution of phase separation in concentrated statistical copolymer solutions and dissolution of phase-separated domains in polymer blends are given.

A Polymer Thin-Film Technique to Study Phase Separation

1985 ◽  
Vol 43 ◽  
pp. 82-83
Author(s):  
O.L. Shaffer ◽  
V. Dimonie ◽  
M.S. El-Aasser ◽  
J.W. Vanderhoff
Keyword(s):  
Thin Film ◽  
Phase Separation ◽  
Standard Sample ◽  
Solid Polymer ◽  
Study Phase ◽  
Polymer Phase ◽  
Polymer Thin Film ◽  
Polymer Systems ◽  
Excellent Method ◽  
Thin Film Technique

There is a great deal of interest in the morphology of polymers. Polymer systems such as physical blends, copolymers and latexes of the core-shell type have become increasingly important in “designing properties”. of the final polymer. Phase separation examination is an excellent method of studying the morphology in these polymer systems.Normally phase separation in polymers has been studied by TEM. The standard sample preparation is to embed the solid polymer in epoxy and then microtome. Microtoming can create artifacts such as distortion due to the knife, cutting difficulty with a rubber phase and possible polymer-epoxy interaction. Because of the above mentioned problems a thin film technique has been developed to circumvent the microtoming procedure. A ruthenium tetrox-ide (RUO4) stain was also used to increase contrast.

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