Abstract
Cationic block copolymers containing a quaternized pyridinium salt and hydrophobic acrylates were prepared, and their fundamental properties as ink dispersants were evaluated. Block copolymers containing methyl acrylate (MA), ethyl acrylate (EA), or butyl acrylate (BA) as hydrophobic segments successfully dispersed dye particles in aqueous media; however, polymers containing octyl acrylate (OA), hexyl acrylate (HA), cyclohexyl acrylate (CyHA), or phenoxyethyl acrylate (PhEA) did not exhibit good dispersibility. Color dispersions containing block copolymers consisting of 4-vinylpyridine (4VP) and BA (poly(BA-b-4VP)) exhibited the lowest viscosity among all polymers examined and maintained a stable dye dispersion. The results of this study suggest that the hydrophobic/hydrophilic balance, flexibility of the polymer chain, and degree of molecular interaction between the dye and hydrophobic segment of the polymer chain should be carefully examined and optimized for better performance. This study demonstrates the application potential of quaternized pyridinium cations in the field of dispersants and surfactants.
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Acknowledgements
The author (TO) thanks Kana Ohira (Seiko Epson), and Chikako Fujita (Seiko Epson) for the GPC measurements and NMR measurements, respectively. The authors also thank Koichi Terao (Seiko Epson) and Hiroshi Kiguchi (Seiko Epson) for helpful discussions and encouragement, respectively. The authors would like to thank Enago (www.enago.jp) and American Journal Experts (www.aje.com) for the English language review.
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TO and HI designed and performed the experiments and analyzed the results. All the authors discussed the experimental results and commented on the manuscript. All authors have given approval to the final version of the manuscript.
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Ohtake, T., Ito, H. & Toyoda, N. Amphiphilic block copolymer surfactant-containing quaternized pyridinium salt segments for color dispersion. Polym J 54, 1203–1211 (2022). https://doi.org/10.1038/s41428-022-00673-5
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DOI: https://doi.org/10.1038/s41428-022-00673-5