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Observation of Nematic Texture in a Diblock Copolymer Melt

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Othmer Department of Chemical & Biological Sciences & Engineering and Department of Electrical Engineering, Polytechnic University, Brooklyn, New York 11201, Department of Polymer Science and Engineering, University of Massachusetts, Amherst, Massachusetts 01013, and Department of Chemical Engineering and Materials Sciences Division, Lawrence Berkeley National Laboratory, University of California, Berkeley, California 94720
Cite this: Macromolecules 2006, 39, 9, 3377–3385
Publication Date (Web):April 1, 2006
https://doi.org/10.1021/ma052413w
Copyright © 2006 American Chemical Society

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    Abstract

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    We have observed nematic textures in polarized optical microscopy and “plus” (+) patterns in depolarized light scattering (four lobes parallel to polarizer/analyzer axes) from a deeply quenched diblock copolymer melt with a cylindrical microstructure. Both of these features are similar to those found in nematic liquid crystalline polymers. In contrast, this same polymer sample exhibits a more conventional grain structure at shallower quench depths, characterized by an “X” pattern in depolarized light scattering (lobes at 45° to polarizer/analyzer axes). A theoretical model is used to analyze the “plus” scattering patterns obtained from nematic textures in the single scattering limit. This model is used to quantify the nature of local correlations in our deeply quenched block copolymer melt. We show that the nematic texture is easy to align by shear flow while the granular structure is not.

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     Othmer Department of Chemical & Biological Sciences & Engineering and Department of Electrical Engineering, Polytechnic University.

    *

     To whom correspondence should be addressed.

     Department of Chemical Engineering, and Materials Sciences Division, Lawrence Berkeley National Laboratory, University of California, Berkeley.

    §

     Department of Polymer Science and Engineering, University of Massachusetts.

    Cited By

    This article is cited by 1 publications.

    1. Zhuangxi Fang, Maurice C. Newstein, Bruce A. Garetz, and Nitash P. Balsara . Measurement and Analysis of the Angular Guided-Wave Depolarized Light Scattering Patterns from Block Copolymer Thin Films. Macromolecules 2010, 43 (23) , 10071-10077. https://doi.org/10.1021/ma101791m

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