Curving and Frustrating Flatland

Two polymer chains that occupy equal volumes when covalently linked together at one end self-assemble into an alternating lamellar morphology that has a characteristic period dictated by the molecular weight. When such copolymers are confined within alumina membranes that have cylindrical pores with...

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Bibliographic Details
Published in:Science (American Association for the Advancement of Science) 2004-10, Vol.306 (5693), p.76-76
Main Authors: Shin, Kyusoon, Xiang, Hongqi, Moon, Sung In, Kim, Taehyung, McCarthy, Thomas J., Russell, Thomas P.
Format: Article
Language:English
Subjects:
Applied sciences
Block copolymers
Brevia
Chemistry
Copolymers
Curvature
Cylinders
Diameters
Energy
Exact sciences and technology
Geometry
Macromolecules
Materials
Nanostructured materials
Organic polymers
Physicochemistry of polymers
Polymers
Properties
Properties and characterization
Structure, morphology and analysis
Transmission electron microscopy
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Description
Summary:Two polymer chains that occupy equal volumes when covalently linked together at one end self-assemble into an alternating lamellar morphology that has a characteristic period dictated by the molecular weight. When such copolymers are confined within alumina membranes that have cylindrical pores with diameters comparable to the repeat period, the interaction of the blocks with the confining walls and the imposed curvature induces a morphological transformation to relieve the constraints. Here, we show a lamella-to-toroid transition, captured through the dissolution of the surrounding membrane.
ISSN:0036-8075
1095-9203
DOI:10.1126/science.1100090