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Surface morphologies and wetting properties of layer-by-layer assembled films of polyelectrolytes with bimodal molecular weight distribution

  • Polymer, Industrial Chemistry
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Abstract

Layer-by-layer (LbL) assembly has been rigorously applied to the construction of superhydrophobic surfaces. Typically, this involves generating a hierarchical porous structure which is then coated with a low surface energy compound. In this study, a porous LbL film was constructed from poly(allylamine hydrochloride) (PAH)/poly(acrylic acid) (PAA) using a PAA solution with a bimodal molecular weight distribution. This solution was prepared by mixing two PAA solutions with different average molecular weights (100,000 and 15,000 g/mol). The mixing ratio was adjusted for fine control of the porous structure, which was induced by acid treatment at pH 2.0–2.4. Generally, surface pore structure was weakened as the 15,000 g/mol PAA ratio increased. However, the surface roughness decreased or increased as the 15,000 g/mol PAA ratio increased depending on the acid treatment pH and time. The porous LbL films were coated with fluorinated silane to make them hydrophobic. When the acid condition was pH 2.4 for 5 min, the water contact angle decreased significantly from 132° to minimum of 105° as the amount of 15,000 g/mol PAA increased. However, at pH 2.0 for 5 min, the water contact angle decreased smaller from 148° to 139° as the amount of 15,000 g/mol PAA increased.

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Acknowledgements

This work was supported by the National Research Foundation of Korea (NRF) grant funded by the Korea government (MSIT) (2018R1C1B5085125). This research was also supported by Basic Science Research Capacity Enhancement Project through Korea Basic Science Institute (Core-facility for Converging Materials) grant funded by the Ministry of Education (2019R1A6C1010045).

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Authors and Affiliations

  1. Polymeric Materials Engineering Major, Dong-eui University, 176 Eomgwang-ro, Busanjin-gu, Busan, 47340, Korea

    Choonghyun Sung, Subin Choi & Jinkyeong Kim

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  1. Choonghyun Sung
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  2. Subin Choi
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  3. Jinkyeong Kim
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Correspondence to Choonghyun Sung.

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Sung, C., Choi, S. & Kim, J. Surface morphologies and wetting properties of layer-by-layer assembled films of polyelectrolytes with bimodal molecular weight distribution. Korean J. Chem. Eng. 37, 1266–1273 (2020). https://doi.org/10.1007/s11814-020-0545-y

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  • DOI: https://doi.org/10.1007/s11814-020-0545-y

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