Moisture induced crack filling in barrier coatings containing montmorillonite as an expandable phase
journal contribution
posted on 2008-04-01, 00:00authored byF Miccichè, H Fischer, Russell Varley, S van der Zwaag
In order to explore the option of healing surface scratches in coatings using an expandable phase, the crack filling behavior of transparent, multi layer coating consisting of a polysiloxane film on top of a thin montmorillonite interlayer was studied. The filling process was monitored using confocal and SEM microscopy. Filling of cracks in the polymeric topcoat occurred primarily within the first two hours of exposure to moisture saturated air and resulted in a good restoration of the surface flatness. Beyond this 2 h healing period, further expansion of the clay layers resulted in a "pushing-up" effect of the swollen clay in proximity of the damaged coating. This paper attempts to quantify the crack closure of the clay-containing coating by monitoring changes in scratch width and area as a function of time.
History
Journal
Surface and coatings technology
Volume
202
Pagination
3346-3353
Location
Amsterdam, The Netherlands
ISSN
0257-8972
Language
eng
Publication classification
C Journal article, C1.1 Refereed article in a scholarly journal