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Título : Self-concentration and interfacial fluctuation effects on the local segmental dynamics of nanostructured diblock copolymer melts
Autor : Lund, Reidar; Willner, Lutz; Alegría, Ángel ; Colmenero de León, Juan ; Richter, Dieter
Fecha de publicación : 1-abr-2008
Editor: American Chemical Society
Citación : Macromolecules (Communication to the Editor) 41: 511-514 (2008).
Resumen: Even simple A-B diblock copolymers display a rich phase diagram in terms of various morphologies created upon spontaneous self-assembly into A- and B-block rich domains in the nanometer range. These ordered structures display a broad range of symmetries ranging from spherical, cylindrical, lamellar, to bicontinuous geometries. For block copolymers with asymmetry, i.e., when the fraction of the A block, fA, is low, highly curved surfaces are favored, leading to a variety of cylindrical micelles in hexagonal lattices or spherical micellar-like structure ordered in body/face centered cubic (bcc/fcc) lattices where the chains are effectively confined in two or three dimensions, respectively. By using more symmetric block copolymers, confinement in one dimension can be realized in a lamellar structure. This gives an interesting “dimensional” flexibility in the study of the confinement effects. In addition, very importantly, the effective confining “wall” can be varied selectively from soft to hard by using respectively a majority polymer block having a low or high glass transition temperature, Tg.
Descripción : 4 pages.-- Supporting Information Available: Details of synthesis and characterization of polymers as well as the structural SAXS results. This material is available free of charge via the Internet at http://pubs.acs.org.
Versión del editor: http://dx.doi.org/10.1021/ma702477n
URI : http://hdl.handle.net/10261/7393
DOI: 10.1021/ma702477n
ISSN: 0024-9297
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