Scratching Of Polymeric Coatings: Experimental Study
And Mechanical Analysis
Author(s)
I. Demirci, C. Gauthier & R. Schirrer
Abstract
Scratching of polymeric coatings: experimental
study and mechanical analysis
I. Demirci, C. Gauthier & R. Schirrer
Institut Charles Sadron, CNRS UPR 22, Strasbourg, France
Abstract
Coating with polymers is a common way of improving the scratch resistance of
polymeric glasses. It is generally accepted that the critical load generating the
fnst damage in a scratch test is representative of the behaviour of the coating. As
the properties of polymers are time and temperature dependent, a single value of
the critical load nevertheless cannot describe the overall mechanical response. A
new scratch apparatus has been built that allows scratchng velocities in the
range 1 to lo4 pmls at temperatures varying from -70 to +120°C. The unique
feature of ths experimental set-up is a built-in imaging system to record realtime
pictures of the in-situ contact during scratching. Damage to the coating can
thus be observed during the process. In the case of optical coatings, if damage
occurs then cracking appears b
Keywords
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