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Article Dans Une Revue Journal of Applied Polymer Science Année : 2023

Self‐healing polyacrylate coatings with dynamic H‐bonds between urea groups

Résumé

Adding self-healing properties to coatings is a promising way to increase their lifetime. Despite an increasing popularity, lots of self-healing polymers are not suited for commercial coatings because they exhibit poor mechanical properties or require expensive products or high healing temperature (> 100 °C). One way to obtain self-healing abilities with good mechanical properties is by using dynamic H-bonds as they also limit the healing temperature. To do so, urea groups are used since they are well-known for their bonding capacity and can be readily synthetized. In this study, several methacrylate monomers containing urea groups in their side-chain were synthesized from easily accessible amines and isocyanates in a 1 one-step, high-yield synthesis. They were afterwards used in a copolymer containing methyl methacrylate and butyl acrylate monomers. The self-healing properties of the resulting coatings were evaluated with gloss recovery and optical microscopy and the presence of H-bonds in the most promising polymer was investigated with FTIR. The mechanical properties of the coatings as a function of time were checked by nanoindentation creep test. We were able to obtain an affordable, easily prepared polymer that suits the requirements for protective coating applications and shows a complete healing after heating at 75 °C for 1 h.

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Dates et versions

hal-04048154 , version 1 (27-03-2023)

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Marie Mottoul, Sylvain Giljean, Marie‐josé Pac, Véronic Landry, Jean‐françois Morin. Self‐healing polyacrylate coatings with dynamic H‐bonds between urea groups. Journal of Applied Polymer Science, 2023, ⟨10.1002/app.53853⟩. ⟨hal-04048154⟩
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