AhmedSheriff-one+page+summary


 * __Three-Dimensional Analysis of Switching Mechanism of Mixed Polymer Brushes__ (summary)**


 * A polymer brush consists of end-tethered polystyrene and poly(methyl methacrylate) grafted polymer chains stretched away from the substrate due to volume-excluded effect. These two polymers are considered as mixed polymer brushes because they are different polymers anchored on the same substrate.


 * These different polymers in a mixed brush segregate into nanoscopic phases. The phase segregation is a lateral segregation process in a nonselective solvent (bad solvent) in which they will form spherical or elongated clusters.


 * In selective solvents (good solvent), the mixed brush structure may be seen as a combination of lateral and layered segregation mechanisms.


 * These mixed polymer brushes also change it morphology due to nonselective and selective solvent. Some of the effect that causes these mixed polymer brushes to change morphology are either repulsive or attracting forces that cause by these solvents.


 * One polymer from the mixed brush preferentially segregates to the top of the brush, while the other polymer forms clusters segregated on to the grafting surface.


 * One of the most important difference of a mixed brush compared to the homopolymer brush is that not only the height and density profile but also the composition profile depends on the purity of the solvent or solvent quality. In other words, these polymers changes as the environment around them change.


 * One of the objective for the application of mixed polymer brushes is that, it would regulate or switch the interaction forces between the brush and its surroundings or environment that constitute a liquid, solid or vapor.


 * In conclusion, mixed polymer brushes are simply good for switching between attraction and repulsion forces depending on the environment.

3. Denys Usov, Viacheslav Gruzdev, Mirko Nitschke, Manfred Stamm,* Olha Hoy, Igor Luzinov,*Ihor Tokarev, and Sergiy Minko: "Three-Dimensional Analysis of Switching Mechanism of Mixed Polymer Brushes." __Macromolecules (Washington, DC, United States)__ 40.24 (2007): 8774-83. DOI: http://dx.doi.org/10.1021/ma071090w


 * Log**

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