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RESEARCH PRODUCT
Lateral versus perpendicular segregation in mixed polymer brushes.
C. FroeckMarcus MüllerDenys UsovManfred StammSergiy MinkoAndreas Schollsubject
chemistry.chemical_classificationSolventMaterials scienceMorphology (linguistics)chemistryField (physics)Chemical physicsDimpleRipplePerpendicularGeneral Physics and AstronomyPolymerSubstrate (electronics)description
Grafting of incompatible polymers on a substrate prevents macrophase separation and the chains self-assemble laterally. Mixed brushes are exposed to different solvents and the morphology is observed via atomic force and x-ray photoemission microscopy. In a nonselective solvent the different species segregate into parallel cylinders ("ripple structure"). Upon exposure to a selective solvent, we encounter a transition to a "dimple" structure, in which the unfavored component forms clusters. Simultaneously, we observe an enhanced perpendicular segregation. The experimental observations are compared to self-consistent field calculations, where qualitative agreement is found.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2002-01-02 | Physical review letters |