Authors
|
Minko, S. ; Müller, M. ; Usov, D. ; Scholl, A. ; Froeck, C. ; Stamm, M.
|
Title
|
Lateral versus Perpendicular Segregation in Mixed Polymer Brushes
|
Date
|
10.01.2002
|
Number
|
10101
|
Abstract
|
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.
|
Publisher
|
Physical Review Letters
|
Wikidata
|
Q61609134
|
Citation
|
Physical Review Letters 88 (2002) 35502, 1-4
|
DOI
|
http://dx.doi.org/10.1103/PhysRevLett.88.035502
|
Tags
|
surface separation layer films thin
|