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Acylhydrazone-Functionalized Waterborne Polyurethane Coating: An Intelligent Protective Material Integrating High
Jing-Ying Yang1, Gen-Yi Guo1, Ming-Hao Liu1
1School of Materials Science and Engineering, Inner Mongolia University of Science and Technology, Baotou, Inner Mongolia 014010, China.
ACS Macro Letters
|June 11, 2026
Summary
A novel protective coating material was developed using a diacylhydrazone-derived molecule. This advanced material offers high mechanical strength, rapid self-healing, and acid-responsive fluorescence for corrosion sensing applications.
Area of Science:
- Materials Science
- Polymer Chemistry
- Nanotechnology
Background:
- Developing advanced protective coatings with self-healing and sensing capabilities is crucial for material longevity.
- Waterborne polyurethanes (WPUs) are versatile polymers, but often require enhancements in mechanical properties and functionality.
- Diacylhydrazone derivatives offer potential for creating functional materials with dynamic properties.
Purpose of the Study:
- To synthesize a novel diacylhydrazone-derived molecule (HDs) for integration into waterborne polyurethane (WPU).
- To enhance the mechanical strength, self-healing ability, and introduce acid-responsive fluorescence to WPU.
- To evaluate the material's potential as a protective coating for acid corrosion sensing.
Main Methods:
- Synthesized HDs via nucleophilic addition of [2,2'-bipyridine]-4,4'-dicarbohydrazide and 4-(N,N-diethylamino) salicylaldehyde.
- Incorporated HDs into WPU, creating WPU-HDs3, and analyzed hydrogen bond content using Fourier transform infrared spectroscopy.
- Tested mechanical properties (tensile strength, elongation at break, toughness), self-healing rate, adhesion, and fluorescence response under acidic conditions.
Main Results:
- The introduction of HDs increased ordered hydrogen bonds in WPU from 43.3% to 50.4%.
- WPU-HDs3 exhibited significantly enhanced mechanical properties: 69.3 MPa tensile strength, 1257.8% elongation at break, and 309.5 MJ/m³ toughness.
- Achieved 100% self-healing rate within 24h at room temperature and demonstrated good adhesion (13.28 N peel force).
- The material displayed reversible fluorescence response under acidic conditions due to protonation/deprotonation and altered proton-coupled electron transfer (PCET) mechanisms.
Conclusions:
- The developed WPU-HDs3 coating possesses superior mechanical strength, efficient self-healing, and excellent adhesion.
- The acid-responsive fluorescence enables its application as a smart coating for detecting acid corrosion.
- The dynamic cross-linked network formed by HDs and WPU is key to the material's enhanced properties and sensing capabilities.
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