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| Titel: |
Scratch and Mar Performance of Coatings: Measurement and Structure Property Relationships |
| Auteur: |
Adamsons, Karlis Barsotti, Robert J. Lin, Li Gregorovich, Basil V. McGonigal, Paul Neff, Bruce Blackman, Greg Nordstrom, Dave |
| Verschenen in: |
International journal of polymer analysis & characterization |
| Paginering: | Jaargang 5 (2000) nr. 4-6 pagina's 289-311 |
| Jaar: |
2000-05-01 |
| Inhoud: |
Scratch and mar of coatings is an important aspect of retaining initial performance levels. A number of test methods have been developed to measure coating resistance to damaging conditions. For the coatings industry, it is critical to have accelerated tests that indicate probable long term (i.e., service life) performance, and to have a means to correlate mar performance with chemical substructures of coatings. In this paper the synergism of measurement techniques for monitoring scratch and mar performance is explored. Laboratory mar tests, which have been validated by commercial experience, are used as the basis for comparison of a coating's performance. The combined elements of chemical, physical, mechanical, morphological and appearance properties of coatings have been explored. Chemical changes during cure and subsequent exposure have been followed by infrared techniques which show degree of cure, extent of photo-oxidation and hydrolysis, as well as changes in cross-linking with time and temperature. Physical and mechanical properties measured include Tg, hardness, standard stress/strain measurements, as well as “Method of Essential Work”. Physical properties can be correlated with visual recovery of plastic flow damage and resistance to mar. Furthermore, microscratch experiments have been utilized to explore forces that are needed to induce surface damage and to determine the transitions between elastic deformation, plastic flow, and brittle fracture type damage. Morphology of scratches was examined by the use of atomic force microscopy before and after exposure. Optical imaging techniques were used to characterize scratch and mar. These studies are useful in understanding mechanisms of coating failure. |
| Uitgever: |
Taylor & Francis |
| Bronbestand: |
Elektronische Wetenschappelijke Tijdschriften |
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