- Author
-
Jean, Y. C.
|
Mallon, P. E.
|
Zhang, R.
|
Chen, H.
|
Li, Y.
|
Zhang, J.
|
Wu, Y. C.
|
Sandreczki, T. C.
|
Suzuki, R.
|
Ohdaira, T.
|
Gu, X.
|
Nguyen, T.
- Title
- Positron Studies of Polymeric Coatings.
- Coporate
- University of Missouri-Kansas City, MO
University of Stellenbosch, Matieland, South Africa
National Institute of Advanced Industrial Science and Technology, Tsukuba, Japan
National Institute of Standards and Technology, Gaithersburg, MD
- Journal
-
Radiation Physics and Chemistry,
Vol. 68,
No. 3/4,
395-402,
October/November 2003
- Keywords
-
coatings
|
weathering
|
degradation
|
polymers
|
slow positrons
- Abstract
- In complicated coating systems, positrons have shown sensitivity in detecting the early stage of deterioration due to weathering, specially, in probing a specific location or depth of coatings from the surface through interfaces and the bulk. Existing extensive experimental positron data show that positron annihilation signals respond quantitatively to the deterioration process due to weathering. Now it is possible to detect the very early stage of coating deterioration at the atomic and molecular scale by using positrons, typically in days as compared to years by conventional methods. This paper summarizes recent positron studies in polymeric coatings. Correlations between positron data and a variety of chemical, physical and engineering data from ESR, AFM, cross-link density, gloss, and cyclic loading are presented.