Relationship between chemical degradation and thickness loss of an amine-cured epoxy coating exposed to different UV environments View Full Text


Ontology type: schema:ScholarlyArticle     


Article Info

DATE

2006-07

AUTHORS

Aziz Rezig, Tinh Nguyen, David Martin, Lipiin Sung, Xiaohong Gu, Joan Jasmin, Jonathan W. Martin

ABSTRACT

The relationship between chemical degradation and thickness loss of an unpigmented, non UV-stabilized, crosslinked amine-cured epoxy coating exposed to three UV conditions was investigated. Spin-coated samples having a thickness of approximately 7 μm on an Si substrate were prepared from a stochiometric mixture of a bisphenol A epoxy resin and a tetra-functional amine curing agent. Samples were exposed outdoors and to two accelerated laboratory UV environments. Chemical degradation and thickness loss were measured by transmission Fourier transform infrared spectroscopy (FTIRS) and laser scanning confocal microscopy (LSCM), respectively. In addition, surface roughness and morphological changes were measured by atomic forcemicrosocopy (AFM) and LSCM. Substantial chemical degradation, thickness loss, and morpholocal changes occurred in the exposed films, and the rate of chemical degradation was greater than that due to the thickness loss. This additional chemical loss was attributed to an inhomogeneous degradation process in which nanoscale localized depressions initiate at certain sites on the surface, which then enlarge and deepen with exposure time. The results of this study provide a better understanding of the degradation mechanism and should lead to the development of scientific-based models for predicting the service life of crosslinked amine-cured epoxy coatings. More... »

PAGES

173-184

Identifiers

URI

http://scigraph.springernature.com/pub.10.1007/bf02774507

DOI

http://dx.doi.org/10.1007/bf02774507

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1052749324


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