TITLE

Dynamics of cross linking fronts in alkyd coatings

AUTHOR(S)
Erich, S. J. F.; Laven, J.; Pel, L.; Huinink, H. P.; Kopinga, K.
PUB. DATE
March 2005
SOURCE
Applied Physics Letters;3/28/2005, Vol. 86 Issue 13, p134105
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
The dynamics of the curing process of alkyd coatings is an important aspect for coating performance. The formation of cross links in an alkyd coating film has been followed in time using a microimaging nuclear magnetic resonance setup, having a spatial resolution of 5 μm perpendicular to the film. During this cross-linking process a front has been observed inside the coating film. The position of this front varied with the square root of time. With the help of a simple reaction model, we have proven that this dynamics results from the fact that the curing rate is limited by the oxygen flux into the coating. This model can also explain, the differences in curing rates observed for various coatings.
ACCESSION #
16702362

 

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