Hydrophobically Modified Polyacrylamide Incorporating Both Hydrophilic and Hydrophobic Units: Enhanced Printability and Stability in Aqueous Ink

For this research, three hydrophobically modified polyacrylamides, HPAAB, HPAAF, and HPAAS, with multiple hydrophobic monomers were designed, synthesized, and used as thickeners in aqueous ink for digital ink-jet printing. The structures were characterized by Fourier transform infrared (FTIR) analys...

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Bibliographic Details
Published in:Molecules (Basel, Switzerland) Switzerland), 2024-10, Vol.29 (21), p.5105
Main Authors: Liu, Zhi-Rui, Tan, Li-Lin, Gao, Juan, Qin, Zi-Ye, Huo, Xin-Xin, Liang, Zhi-Min
Format: Article
Language:English
Subjects:
aqueous ink
Digitization
hydrophobic association
Molecular weight
Nuclear magnetic resonance spectroscopy
Particle size
Polyacrylamide
Polyethylene terephthalate
Polymer industry
Polymerization
Polymers
printability
Printers (Computers)
Printing-ink
Rheology
Solvents
stability
Surfactants
Viscosity
VOCs
Volatile organic compounds
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Summary:For this research, three hydrophobically modified polyacrylamides, HPAAB, HPAAF, and HPAAS, with multiple hydrophobic monomers were designed, synthesized, and used as thickeners in aqueous ink for digital ink-jet printing. The structures were characterized by Fourier transform infrared (FTIR) analysis and nuclear magnetic resonance (NMR) spectroscopy. The viscosity-average molecular weight was determined by intrinsic viscosity determination and was adjusted according to hydrophobic content. The critical association concentration (CAC) of polymers was measured simultaneously using the apparent viscosity method and the fluorescence spectrum. The formation of a network structure and the mechanism of hydrophobic association are visualized dynamically with a scanning electron microscope (SEM) at different concentrations. Under the same conditions, HPAAB exhibited excellent thickening ability across different pH levels, temperatures, and shear rates, which is caused by the longer hydrophobic side chain and the stronger hydrophobic effect of the behenyl polyoxyethylene ether methacrylate (BEM) group. Furthermore, an aqueous ink using HPAAB as a thickener displays significant printability and stability, functioning much better than a corresponding aqueous ink that uses a commercial thickener. This is the first example of a hydrophobic associating polyacrylamide, incorporating both hydrophilic and hydrophobic units within a single hydrophobic chain, thereby serving as an efficient thickener for aqueous ink.
ISSN:1420-3049
1420-3049
DOI:10.3390/molecules29215105