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Preparation of alkali-resistant aluminum pigment encapsulated with fluoropolymer by in situ polymerization

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Abstract

Flaky aluminum pigments with excellent corrosion resistance have found applications in diverse fields. In this study, a fluoropolymer has been incorporated in the aluminum pigment to effectively enhance its corrosion resistance, along with the improvement in the chemical resistance and thermal stability. Specifically, a uniform dense layer of poly(trifluoroethyl methacrylate) (PTFEMA) has been directly coated on the surface of the flaky aluminum pigment by in situ polymerization. The encapsulated aluminum pigment exhibited high stability upon dipping in the alkaline solution (pH = 13) due to protection imparted by the fluoropolymer layer. The morphology of the fluoropolymer layer on the surface of the aluminum pigment was characterized by scanning electron microscopy (SEM). Moreover, the thermal stability of the encapsulated aluminum pigment was analyzed by thermogravimetric analysis (TG). The structure and composition of the fluoropolymer layer were further characterized by Fourier transform infrared spectroscopy (FTIR) and X-ray photoelectron spectroscopy (XPS). The stability of the aluminum pigment in alkaline aqueous media was investigated via hydrogen evolution experiments. Overall, the corrosion resistance of the aluminum pigment encapsulated with fluoropolymer was observed to be markedly improved owing to the presence of the PTFEMA layer.

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Acknowledgments

The work was financially supported by the Open Research Fund Program of Science and Technology on Aerospace Chemical Power Laboratory (STACPL320181B01) (NSFC21875061)(NSFC21975066), Young Taishan Scholars tsqn [Grant No. 20161036] and the National Science Foundation of China [Grant No. 21304037], National Science Foundation of China [Grant No. 21675064], and Major Natural Science Foundation of Shandong Province [Grant No. ZR2017ZC0529].

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Author notes

  1. Pengchao Men and Jihong Liang contributed equally in this work.

Authors and Affiliations

  1. Shandong Provincial Key Laboratory of Fluorine Chemistry and Chemical Materials, School of Chemistry and Chemical Engineering, University of Jinan, Jinan, 250022, China

    Pengchao Men, Jihong Liang, Jian Chen & Bing Geng

  2. Science and Technology on Aerospace Chemical Power Laboratory, Xiangyang, 441003, Hubei, China

    Jinxuan He & Wei Li

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  1. Pengchao Men
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Correspondence to Bing Geng or Wei Li.

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Men, P., Liang, J., He, J. et al. Preparation of alkali-resistant aluminum pigment encapsulated with fluoropolymer by in situ polymerization. J Coat Technol Res 18, 1227–1235 (2021). https://doi.org/10.1007/s11998-021-00481-1

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  • DOI: https://doi.org/10.1007/s11998-021-00481-1

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