Journal
PROGRESS IN ORGANIC COATINGS
Volume 64, Issue 2-3, Pages 156-162Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.porgcoat.2008.09.023
Keywords
Self-healing; Thermo-reversible; (Powder)coating; Rheology
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Key properties of organic coatings, such as mechanical strength and solvent resistance, are greatly influenced by the structure of the polymeric binder. In general, a 3-dimensional polymeric network gives the best properties and therefore most performance coatings have a 3-dimensional network structure. However, 3-dimensional networks cannot easily be repaired. Through molecular design in combination with different synthetic routes, a series of new building blocks has been prepared that render conventional coating types thermally remendable. Damage can be repaired through thermally reversible cross-linking of the coating through reversible bond scission within these specially designed building blocks. At room temperature, a fully cross-linked network is present,whereas at elevated temperatures the cross-link density becomes much lower and the system becomes mouldable or low viscous. This self-healing concept was proven by various techniques. Both the thermal reversibility window and the final coating properties can be tuned by careful design of the system. (C) 2008 Elsevier B.V. All rights reserved.
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