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Halloysite nanotubes as a stabilizer: fabrication of thermally expandable microcapsules via Pickering suspension polymerization

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Abstract

Core-shell thermally expandable microcapsules were prepared via Pickering suspension polymerization. Acrylonitrile (AN) and methyl methacrylate (MMA) were used as the comonomers and the halloysite nanotubes (HNTs) were used as the Pickering emulsifier. The influence of the HNT concentration, AN/MMA ratio, and types of hydrocarbon was investigated. When the HNT concentration was 0.6 wt%, the microcapsules exhibited a core-shell morphology that contained approximately 35 wt% of the blowing agents with an average particle size of 232.0 μm. Increasing the MMA contents resulted in a larger particle size and lower thermal stability. Core-shell microcapsules could be synthesized using iso-hexane, iso-octane, and n-octane, but microcapsules could not be fabricated with n-pentane. At 1 and 3 bar, the contents of the encapsulated blowing agents were 10 %, whereas the contents of the encapsulated blowing agents were approximately 35 and 60 % at 1.5 and 2 bar, respectively.

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Acknowledgments

This study was supported by a grant (10045051) from the Korea Ministry of Trade, Industry and Energy (MOTIE), Republic of Korea.

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Authors and Affiliations

  1. Department of Chemistry & Chemical Engineering, Inha University, 100 Inha-ro, Namgu, Incheon, 402-751, Republic of Korea

    Jeong Gon Kim, Sung-Hyun Baeck & Sang Eun Shim

  2. Automotive Materials Convergence & System R&D Division, Korea Automotive Technology Institute, Chungnam, 330-912, Republic of Korea

    Jin Uk Ha & Sun Kyoung Jeoung

  3. NEO CHEMS Co., Ltd, 64 Chorok-ro, Yanggam-myeon, Hwaseong-si, Gyeonggi-do, 445-933, Republic of Korea

    Kangseok Lee

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  1. Jeong Gon Kim
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  2. Jin Uk Ha
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  3. Sun Kyoung Jeoung
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  4. Kangseok Lee
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  5. Sung-Hyun Baeck
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Correspondence to Sang Eun Shim.

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Kim, J.G., Ha, J.U., Jeoung, S.K. et al. Halloysite nanotubes as a stabilizer: fabrication of thermally expandable microcapsules via Pickering suspension polymerization. Colloid Polym Sci 293, 3595–3602 (2015). https://doi.org/10.1007/s00396-015-3731-4

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  • DOI: https://doi.org/10.1007/s00396-015-3731-4

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