Water‐soluble top coats for orientation control of liquid crystal‐containing block copolymer films |
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| Authors: | He‐Lou Xie Xiao Li Hyo Seon Suh Jia‐Xing Ren Ling‐Shu Wan Gordon S. W. Craig Christopher G. Arges Paul F. Nealey |
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| Affiliation: | 1. College of Chemistry, Xiangtan University, Xiangtan, Hunan Province, China;2. Institute for Molecular Engineering, The University of Chicago, Chicago, Illinois;3. Institute of Polymer Science, Zhejiang University, Hangzhou, China;4. Cain Department of Chemical Engineering, Louisiana State University, Baton Rouge, Louisiana |
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| Abstract: | An easily removable, water‐soluble top coat of polyvinylpyrrolidone (PVP) is used to control the orientation of microdomains in a liquid crystalline block copolymer (LC BCP, poly(ethylene oxide)‐block‐poly(6‐(4‐methoxy‐azobenzene‐4′‐butyl) hexyl methacrylate)). The corresponding LC homopolymer is also investigated for comparison. Atomic force microscopy is used to determine the orientation of the cylindrical microdomains of the LC BCP. UV–vis spectroscopy and grazing incidence wide‐angle X‐ray scattering are used to determine the orientation of the LC mesogens in the LC homopolymer and the LC BCP films annealed both with and without a top coat. Once the LC BCP morphology is self‐assembled, the PVP top coat layer can be easily removed with water or alcohol. The facile removal of the top coat improves the processability of BCPs in technological applications, and enables direct investigation of the BCP morphology in scientific studies. © 2017 Wiley Periodicals, Inc. J. Polym. Sci., Part B: Polym. Phys. 2017 , 55, 1569–1574 |
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| Keywords: | anchoring block copolymer cylinder liquid crystal self‐assembly top coat |
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