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    Dewetting of Thin Polymer Films on Wrinkled Graphene Oxide Monolayers

    Year: 2019

    Journal: Langmuir, Volume 35, 1-Apr, page 5549–5556

    Authors: Jo, Kyoung-Il; Kim, Tae-Ho; Choi, Ki-In; Lee, Hoyeon; Cho, Jae-Hak; Bang, Joona; Kim, Tae-Hwan; Yuan, Guangcui; Satija, Sushil K.; Koo, Jaseung

    Organizations: Chungnam National University; National Research Foundation of KoreaNational Research Foundation of Korea [2017M2A2A6A01019911]

    We investigated the effect of the morphological structure of a graphene oxide (GO) monolayer on the dewetting dynamics of the upper polymer thin films. The Langmuir-Schaefer (LS) technique was used to prepare a wrinkled GO (wrGO) structure with a root mean square (rms) roughness of 22.7 angstrom. The dewetting behavior of poly(methyl methacrylate) (PMMA) thin films on the wrGO monolayers was perfectly prevented, whereas the PMMA thin films on a flat GO monolayer were dewetted at 203 degrees C. This wrinkle effect of the GO can be also obtained when the GOs monolayers are intercalated to the PMMA/polystyrene (PS) interface. In this multilayer, the flat GO monolayer at the interface between the PS and PMMA layers was spontaneously roughened with rms roughness of 46.9 angstrom after annealing and also prohibited the dewetting behavior. From the results, we found that to improve the compatibility of polymer blends by adding the two-dimensional nanosheets, it is important to control the morphological structure of the sheets at the interface, along with manipulation of the GO-polymer interactions.
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