Abstract
We conducted a detailed investigation of the influence of the material properties of dynamic polymer network coatings on their self-healing and damage-reporting performance. A series of reversible polyacrylate urethane networks containing the damage-reporting diarylbibenzofuranone unit were synthesized, and their material properties (e.g., indentation modulus, hardness modulus, and glass-transition temperature) were measured conducting nanoindentation and differential scanning calorimetry experiments. The damage-reporting and self-healing performances of the dynamic polymer network coatings exhibited opposite tendencies with respect to the material properties of the polymer network coatings. Soft polymer network coatings with low glass-transition temperature (~10 °C) and indentation hardness (20 MPa) exhibited better self-healing performance (almost 100%) but two times worse damage-reporting properties than hard polymer network coatings with high glass-transition temperature (35~50 °C) and indentation hardness (150~200 MPa). These features of the dynamic polymer network coatings are unique; they are not observed in elastomers, films, and hydrogels, whereby the polymer networks are bound to the substrate surface. Evidence indicates that controlling the polymer’s physical properties is a key factor in designing high-performance self-healing and damage-reporting polymer coatings based on mechanophores.
Highlights
Mechanophores are molecules that can undergo chemical changes in response to an externally applied mechanical force [1,2,3,4,5,6]
We report a detailed investigation of the influence that the maIn the terial present paper, we a detailed of thehave influence thatself-healing the properties of report dynamic polymerinvestigation network coatings on their and material properties of dynamic polymer network coatings have on their self-healing and damage-reporting performance
In this paper is described a detailed investigation of the influence of the material properties of stress-sensitive dynamic polymer network coatings on their damage-reporting and damage-healing performances
Summary
Mechanophores are molecules that can undergo chemical changes in response to an externally applied mechanical force [1,2,3,4,5,6]. In the case of these coatings, the damagesuch as pH-sensitive dyes and fluorescent molecules, into the microcapsules comprising reporting function can be achieved by embedding damage indicators, such as healing agents [13,14,15]. Effect ofover the material properties a low elastic modulus (G0 )value arethe preferred hard coatings to achieve high on the damage-reporting performance of a mechanically dynamic network self-healing efficiency [16,17,18,19,20]. The surface damage-reporting and self-healing performance of the polymer networks were characterized using a micro-scratch tester equipped with an optical microscope With these measurement data in hand, the relationship between the material properties and the damage-reporting and self-healing performance of the dynamic network polymers was systematically investigated
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