Visco-elastic visco-plastic analysis of scratch resistance of organic coatings

Nanotribological Characterization of Polymeric Nanocoatings: From Fundamental to Application

“…In our recent findings, it has been shown that in order to design a polymer with appropriate scratch resistance, its toughness should be enhanced. In fact, the tough polymeric materials have high capability of stress damping together with high scratch resistance (Courter 1997;Hara et al 2000;Jardret and Morel 2003;Jardret and Ryntz 2005;Groenewolt 2008). The scratches on tough polymers are both in forms of plastic (with self-healing ability) and fracture deformations.…”

“…(Tahmassebi et al 2010;Ramezanzadeh et al 2011a, b) In the second approach, enhancing the cohesive forces within a polymer could prevent sharp objects from polymer chains tearing. Therefore, changing polymer viscoelastic properties is another way of controlling scratch resistance (Courter 1997;Jardret et al 1998;Hara et al 2000;Jardret and Ryntz 2005). In order to investigate polymers scratch resistance precisely, it is necessary to evaluate their viscoelastic-viscoplastic properties as well as the difference between the tensile and compressive behaviors.…”

Effects of Environmental Conditions on Degradation of Automotive Coatings

“…Elastic deformation has limited effect on the appearance of a coating, therefore determination of plastic and fracture deformation seem more important. Some scratches are irregular and of a fractured nature (Figure 5-a) and may involve material loss, while others are smooth ( Figure 5-b), regular and involve plastic deformation of clear coats (Lin et al, 2000;Ramezanzadeh et al, 2010;Jardret & Morel, 2003;Jardret & Ryntz, 2005;Jardret et al, 1998). .…”

Coatings for Plastic Parts

“…Scratch resistance is gaining importance for exterior plastic coatings as well as for OEM coatings [38][39][40]. Body-color-painted large parts are prone to critical examination, owing to frequent customer complaints about scratch-sensitive bumper surfaces.…”