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Kim, So Youn
Laboratory for Soft Materials Nanophysics
Research Interests
  • Colloids, particle dispersions, polymer nanocomposite, block copolymers

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Tailored growth of graphene oxide liquid crystals with controlled polymer crystallization in GO-polymer composites

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Title
Tailored growth of graphene oxide liquid crystals with controlled polymer crystallization in GO-polymer composites
Author
Mun, Soh JinShim, Yul HuiKim, Geon WoongKoo, Sung HwanAhn, HyungjuShin, Tae JooKim, Sang OukKim, So Youn
Issue Date
2021-01
Publisher
Royal Society of Chemistry
Citation
NANOSCALE, v.13, no.4, pp.2720 - 2727
Abstract
Graphene Oxides (GOs) have been frequently employed as fillers in polymer-based applications. While GO is known to nucleate polymer crystallization in GO-polymer composites reinforcing the mechanical properties of semicrystalline polymers, its counter effect on how polymer crystallization can alter the microstructure of GO has rarely been systematically studied yet. In this work, we study the GO nematic liquid crystal (LC) phase during polymer crystallization focusing on their hierarchical structures by employing in situ small/wide-angle X-ray scattering/diffraction (SAXS/WAXD) techniques. We found that GO LC and polymer crystals co-exist in the GO/polymer complex, where the overall liquid crystallinity is influenced by polymer crystallization. While polymer crystallizes in bulk or at the interface depending on the cooling rate, the interfacial crystallization of poly(ethylene glycol) (PEG) on GO improves both GO alignment and orientation of PEG crystal. This work provides an opportunity to develop a hierarchical structure of GO-based crystalline polymer nanocomposites, whose directionality can be controlled by polymer crystallization under proper cooling rates.
URI
https://scholarworks.unist.ac.kr/handle/201301/54142
DOI
10.1039/d0nr07858a
ISSN
2040-3364
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ECHE_Journal Papers
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