Preparation and properties of a novel remendable coating concept
article
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. © 2008 Elsevier B.V. All rights reserved.
Topics
PowdercoatingRheologyThermo-reversibleColloidsElasticityMaintenanceMechanical propertiesOrganic coatingsPlasticityRheologyViscosityBond scissionsBuilding BlocksCoating propertiesConventional coatingsDimensional networksElevated temperaturesLink densitiesMechanical strengthsMolecular designsPolymeric bindersPolymeric networksRoom temperaturesSelf-healingSolvent resistancesSynthetic routesThermo-reversibleCoatings
TNO Identifier
241389
ISSN
03009440
Source
Progress in Organic Coatings, 64(2-3), pp. 156-162.
Pages
156-162
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