Assay of weathering effects on protective polymer coatings using positron annihilation spectroscopy

Conference · Wed Feb 01 00:00:00 EST 1995

OSTI ID:10122006

Hulett, Jr, L D; Wallace, S; Xu, Jun ^[1]; Nielsen, B; Szeles, Cs; Lynn, K G ^[2]; Pfau, J; Schaub, A

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1. Oak Ridge National Lab., TN (United States)
2. Brookhaven National Lab., Upton, NY (United States)

Polymer coatings, both with and without pigments, have been subjected to solar radiation and water spray weathering. The degrees of penetration of the weathering effects have been measured by injecting positrons of varying energy, i.e. to variable depths, into the films and observing the Doppler broadening of the annihilation radiation. The method is capable of detecting changes due to weathering effects at very early stages, long before visual examination reveals degradation. As little as one week of exposure caused measurable changes in the polymer structure, which were reflected in the Doppler broadening. Given further development, positron spectroscopy could possibly become a useful complement to the other methods of determining weatherabilities of protective polymer coatings.

• Research Organization: Oak Ridge National Lab., TN (United States); Brookhaven National Lab., Upton, NY (United States)
• Sponsoring Organization: USDOE, Washington, DC (United States); Hungarian Science Foundation (Hungary)
• DOE Contract Number: AC05-84OR21400; AC02-76CH00016
• OSTI ID: 10122006
• Report Number(s): CONF-9405198-4; ON: DE95007040; CNN: Contract OTKA-2106/91; TRN: 95:002287
• Resource Relation: Conference: 6. international workshop on slow-positron beam techniques for solids and surfaces (SLOPOS6),Makuhari (Japan),18-22 May 1994; Other Information: PBD: [1995]
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
74 ATOMIC AND MOLECULAR PHYSICS
PROTECTIVE COATINGS
WEATHERING
POSITRONIUM CHEMISTRY
PERFORMANCE TESTING
PAINTS
PIGMENTS
DOPPLER BROADENING
SOLAR RADIATION
POSITRONS
ANNIHILATION
SAMPLE PREPARATION
TITANIUM OXIDES
SPECTROSCOPY
360604
360605
664300
CORROSION, EROSION, AND DEGRADATION
RADIATION EFFECTS
COLLISION PHENOMENA