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Issue 43, 2019
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Construction of dimetal-containing dithiolene and Schiff base conjugated polymer coating: exploiting metal coordination as a design strategy for improving infrared stealth properties

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Abstract

In order to reduce mid–far-infrared emissivity while enhancing the near-infrared absorption properties of polymer coating systems, bimetal coordination conjugated polymer coatings are fabricated via baking organic linkers (oligomer-containing nickel bis(dithiolene) moiety, 3,3′-diaminobenzidine, metal salts) in the presence of co-reagents (dimethylacetamide and acetic acid). By varying the reaction temperature, feed ratios and quantity of metals, the degree of cross-linking of the metallopolymer (MOP) coating could be precisely controlled with an excellent film-forming property. The structures were confirmed by FT-IR, XPS and ICP. The results indicate a metal (Cu, La, Sm and Lu) coordination effect with conjugated polymer main chains being formed together with nickel-bis(dithiolene) structures. Due to the high electron deficiency ability of the nickel bis(dithiolene) moiety, all MOP coatings show electron transport behaviors without hole transport properties, except for NiCu-PTBN and NiSm-PTBN. Doping of CuBr2 and Sm(OAc)3·6H2O with a metal coordination effect under carefully controlled conditions gives rise to NiCu-PTBN and NiSm-PTBN coatings with hole mobilities up to 2.9 × 10−4 cm2 V−1 s−1 and 2.5 × 10−4 cm2 V−1 s−1, respectively. Stealth performance experiments show that the absorption wavelength of the MOP coating is 750–1200 nm in the near-infrared range, which indicates its excellent near-infrared shield properties. The mid–far-infrared emissivity (2–22 μm) of the nickel/samarium-containing coating could decrease to 0.47 ± 0.03. Overall, these results raise the possibility that an MOP coating is a prospective candidate for infrared stealth applications.

Graphical abstract: Construction of dimetal-containing dithiolene and Schiff base conjugated polymer coating: exploiting metal coordination as a design strategy for improving infrared stealth properties

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Publication details

The article was received on 17 Jun 2019, accepted on 21 Aug 2019 and first published on 22 Aug 2019


Article type: Paper
DOI: 10.1039/C9PY00880B
Polym. Chem., 2019,10, 5839-5848

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    Construction of dimetal-containing dithiolene and Schiff base conjugated polymer coating: exploiting metal coordination as a design strategy for improving infrared stealth properties

    J. Cai, J. Han, G. Ma, X. Liu, J. Wang and X. Jian, Polym. Chem., 2019, 10, 5839
    DOI: 10.1039/C9PY00880B

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