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- W1976726724 abstract "Large area microdomain alignment in poly(ethylene oxide-b-6-(4′-cyanobiphenyl-4-yloxy) hexyl methacrylate) block copolymers was successfully accomplished by the application of a 6 T magnetic field while cooling from elevated temperatures in the melt state. Small-angle X-ray scattering demonstrated that lamellar and cylindrical PEO microdomains aligned with their interfaces along the applied field, whereas the smectic layers of the liquid crystalline mesophase are perpendicular to the field. This is in agreement with the positive diamagnetic anisotropy of the cyano-biphenyl mesogen and a homogeneous anchoring condition at the intermaterial dividing surface (IMDS) between the two blocks. The alignment of the system is driven by the diamagnetic anisotropy of the smectic mesophase and not by the crystallization of PEO at lower temperatures. The addition of poly(acrylic acid) and LiClO4 salt result in the suppression of PEO crystallinity and stronger segregation between the polymer blocks leading to improved order in the material. The resulting films are well aligned over millimeter length scales of area and thickness. We use a novel continuous rotational annealing approach to break the degeneracy of the lamellar alignment, permitting facile directed assembly of the system during a single cooling step. Our experiments demonstrate the creation of well-aligned arrays of amorphous PEO domains over large length scales and offer a route to functional materials, in particular, for selective transport applications such as solid ionic electrolytes." @default.
- W1976726724 created "2016-06-24" @default.
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- W1976726724 date "2010-03-08" @default.
- W1976726724 modified "2023-10-14" @default.
- W1976726724 title "Facile Alignment of Amorphous Poly(ethylene oxide) Microdomains in a Liquid Crystalline Block Copolymer Using Magnetic Fields: Toward Ordered Electrolyte Membranes" @default.
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- W1976726724 doi "https://doi.org/10.1021/ma9026349" @default.
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