NOVEL TYPES OF SELF-HEALING COATINGS FOR CORROSION
PROTECTION OF METAL
SUBSTRATES
O. van den Berg1,2, J. Van Damme1,2, F. Du Prez1,2
1 Department of Organic Chemistry, Polymer Chemistry Research Group, Ghent University, Krijgslaan 281 S4-bis, B-9000 Ghent, Belgium.
2SIM vzw, Technologiepark 935, 9052 Zwijnaarde, Belgium
Keywords: self-healing,polyester-urethane acrylate, shape-memory
ABSTRACT
In this work a new concept for simultaneous healing of barrier properties, passivation of the metallic substrate and the esthetic qualities of coatings is discussed. Using strain-recovering (shape-memory) materials, low-viscous UV-cure coating formulations were prepared with either amorphous or semi-crystalline switching units.
Figure 1. Example of an amorphous shape-recovery coating after scratching and recovery
These formulations were successfully applied onto metallic and polymeric substrates to yield coatings that are able to recover from large defects (up to ~ 1 mm in width). Full closure of the defects was observed, similar to the work recently published [1] by Rodriguez et al., however, without the addition of linear, non-functionalized polymer.
REFERENCES
[1] E.D. Rodriguez, X. Luo, P.T. Mather, Linear/Network Poly(ε-caprolactone) Blends Exhibiting Shape Memory Assisted Self-Healing (SMASH), ACS Applied Materials & Interfaces 3 (2011) 152-161.
Damage Healing by exposure to plasticizer
10 mm
